3500 ACT Vocabulary

abandon:   (没有约束,放任情绪) lacking restraint or control; feeling of extreme emotional intensity; unbounded enthusiasm

abandoned:   (被抛弃的,废置的) recklessly unrestrained; deserted; left to destruction

abandonment:   (抛弃,放弃) giving up completely; freedom from constraint

abase:   (降低,羞辱) humiliate; lower or depress in rank or esteem

abash:   (使难堪) embarrass; make ashamed or uneasy; disconcert

abate:   (减弱,减少) subside; decrease; become less in amount or intensity

abbreviate:   (减短,缩写) make shorter; reduce to shorter form intended to represent full form, as for word or phrase

abdicate:   (放弃) give up, renounce, abandon, lay down, or withdraw from, as a right or claim

aberrant:   (不正常的) abnormal; markedly different from an accepted norm

abet:   (帮助,鼓励) aid, usually in doing something wrong; encourage

abeyance:   (悬而未决) suspended action; temporary cessation or suspension

abhor:   (憎恨) fill with horror and loathing; horrify; hate

abide:   (忍耐,忍受,遵守) endure; put up with; bear; tolerate

abiding:   (持久的,容忍) lasting for a long time; enduring; permanent

abjure:   (发誓放弃) renounce upon oath; abandon forever

ablution:   (洗) washing or cleansing of the body, especially as part of religious rite

abnegate:   (克制,放弃) give up or surrender; deny something to oneself

abnegation:   (批判,自我牺牲) repudiation; self-sacrifice; renouncing your own interests in favor of interests of others

abolish:   (废除) cancel; put an end to; destroy completely

abolition:   (废除,取消) ending; act of abolishing; act of doing away with

abominable:   (可恶的,非常糟糕) detestable; extremely unpleasant; very bad

aboriginal:   (原来的,土著的) being the first of its kind in a region; primitive; native

abortive:   (不成功的,失败) unsuccessful; failing to accomplish an intended objective; fruitless

abrade:   (磨损,侵蚀) wear away by friction; scrape; erode

abrasive:   (摩擦的,粗糙的,研磨剂) rubbing away; tending to grind down

abridge:   (删节,节选) condense; shorten; reduce length of written text

abrogate:   (废除) abolish, do away with, or annul, especially by authority

abscond:   (隐匿,逃避,躲债) leave quickly and secretly and hide oneself, often to avoid arrest or prosecution

absent:   (缺少的,不在的,缺席的) go away or leave ; missing; not present

absenteeism:   (旷课,旷工) habitual not to appear, especially for work or other regular duty

abstain:   (控制,限制（自己）) refrain; hold oneself back voluntarily from an action or practice

abstemious:   (节制（饮食）,调节) sparing or moderation in eating and drinking; temperate

abstruse:   (难以理解的,复杂的) obscure; profound; difficult to understand.

abundant:   (丰富,富足) plentiful; possessing riches or resources

abundantly:   (丰富地) in great numbers; in a plentiful or sufficient degree; plentifully

abut:   (毗邻) border upon; adjoin; touch or end at one end or side; lie adjacent

abysmal:   (无底的) bottomless; very profound; limitless; very bad

accede:   (同意) agree; give consent, often at insistence of another; concede

accelerating:   (加速的) increasing in speed

acceleration:   (加速度) faster rate of improvement; rate of change of velocity with respect to time

accentuate:   (强调,重音) emphasize; stress; pronounce with a stress or accent; mark with an accent

accessible:   (可得到的) easily approached or entered; obtainable; easy to talk to or get along with

accident:   (意外事件,事故) event that takes place without one's foresight or expectation; sudden, and unexpected event

accidentally:   (意外地,偶然地) inadvertently; by chance; casually; fortuitously; not essentially or intrinsically

acclaim:   (赞扬,表扬) applaud; announce with great approval

acclimate:   (适应) accustom or become accustomed to a new environment or situation; adapt

acclivity:   (上山的陡坡,斜坡) upward slope, as of hill

accolade:   (出名的大奖) award of merit; expression of approval; praise

accommodate:   (招待,食宿,适应) do a favor or service for; provide for; supply with; make suitable; adapt; allow for

accommodating:   (乐于助人的) helpful in bringing about a harmonious adaptation

accomplish:   (完成,达到,实现) succeed in doing; bring to pass; achieve; reach the end of; complete

accost:   (搭讪,邂逅) approach and speak to boldly or aggressively, as with demand or request

accouter:   (装备) equip; provide with military equipment

accretion:   (增长) growth or increase in size by gradual external addition, fusion, or inclusion

accrue:   (增加) increase, accumulate, or come about as a result of growth; accumulate over time

accumulation:   (积聚) increase by natural growth or addition; concentration

accusation:   (谴责,控告) indictment; charge of wrongdoing that is made against a person or other party

accustomed:   (习惯了的) habitual to; used to; frequently practiced, used, or experienced; customary

acerbity:   (尖酸的（语气,脾气）) bitterness of speech and temper; sourness or acidness of taste, character, or tone

acetic:   (酸的) having properties of vinegar; sour

achieve:   (完成,实现) gain with effort; accomplish; fulfill

achievement:   (成就,功绩) feat; accomplishment; award for completing a particular task or meeting an objective

acidulous:   (酸的,尖锐,刻薄) slightly sour in taste or in manner; sharp; caustic

acoustics:   (声学的) science of sound; quality that makes a room easy or hard to hear in

acquaint:   (熟悉) inform about; cause to come to know personally; make familiar

acquainted:   (有知识的,知晓的) known by or familiar with another; informed or familiar

acquiesce:   (默许) assent; agree without protesting

acquire:   (获取) gain through experience or effort; gain possession of; locate with tracking system

acrid:   (尖锐,尖酸) unpleasantly sharp or bitter to taste or smell; bitterly pungent

acrimonious:   (挖苦的,尖酸的（语言,行为）) bitter and sharp in language, tone, or manner

acrophobia:   (恐高症) fear of heights; abnormal fear of high places

actively:   (活跃地,积极地) energetically; vigorously; in an active manner; voluntarily, not passively

actuarial:   (保险精算的,精算) calculating; pertaining to insurance statistics

actuate:   (推动,促使) put into motion or action; activate

acuity:   (尖锐) sharpness; acuteness of vision or perception; keenness

acumen:   (思想敏锐) mental keenness; quickness of perception

adaptable:   (能适应的,适应能力强的) flexible; becoming or being made suitable to particular situation or use

adaptive:   (适合的,适应的) having a capacity for adaptation; capable of adapting

addendum:   (附加,补充) something added or to be added, especially a supplement to a book

additional:   (另外的,附加的,额外的) further; extra; supplemental or added to

addle:   (使变疯,腐坏) muddle; drive crazy; become confused

adept:   (擅长于) expert at; very skilled; having or showing knowledge and skill and aptitude

adherent:   (支持者,追随者) person who adheres; one who follows or upholds a leader, party, cause

adhesive:   (胶,粘贴物) glue; paste ; substance that unites or bonds surfaces together

adjoin:   (毗连,临近,贴近) be next to; be contiguous to; border on

adjudicate:   (评判,裁断,判决,宣判) hear and settle a case by judicial procedure

adjunct:   (无用的附加物) something added on or attached generally nonessential or inferior

adjure:   (恳求,恳请) appeal to or entreat earnestly; command or enjoin solemnly, as under oath

administer:   (管理) govern; supervise; give or apply medications

admiration:   (钦佩,赞美) favorable judgment; feeling of pleasure, wonder, and approval

admittedly:   (公认地,诚然,无可否认地) doubtlessly; in an acknowledged manner; confessedly

admonish:   (警告,训斥) warn; counsel someone against something to be avoided

admonition:   (警告) gentle or friendly reproof; cautionary advice or warning

adorn:   (装饰) enhance or decorate with or as if with ornaments

adornment:   (装饰,装饰品) embellishment; decoration; something that beautifies or adorns; ornament

adroit:   (熟练,有技巧) skillful and adept under pressing conditions

adulation:   (奉承,恭维) excessive flattery or admiration; unmerited praise

adulterate:   (掺杂) make impure by adding inferior or tainted substances

adumbrate:   (勾画出轮廓,隐约显示,预示,蒙上阴影) give hint or indication of something; disclose partially or guardedly; overshadow; shade

advance:   (提高,发展,提升) proceed; move forward; improve; moving forward

advanced:   (高级的,年老的,先进的) improved; highly developed or complex; ahead of the times; progressive

advent:   (到来,出现) coming or arrival, especially of something extremely important

adventitious:   (偶然) accidental; casual; not inherent but added extrinsically

adverse:   (讨厌,敌意) in opposing direction; harmful or unfavorable; acting or serving to oppose

advocacy:   (支持,辩护) support; active pleading on behalf of something

aerie:   (猛禽的窝) nest of bird, such as eagle, built on a cliff or other high place

aesthetic:   (审美的) elegant or tasteful; of or concerning appreciation of beauty or good taste

affable:   (平易近人的) easily approachable; warmly friendly

affect:   (影响,假装) have an emotional or cognitive impact upon

affection:   (友爱,挚爱,情爱) fondness; tender feeling toward another; fondness

affectionate:   (亲爱的,挚爱的) having affection or warm regard; loving; fond; kindly inclined; zealous

affinity:   (亲缘关系) natural attraction, liking, or feeling of kinship; relationship by marriage

affirmation:   (正面肯定,确认) positive assertion; confirmation; solemn pledge by one who refuses to take an oath

affix:   (增加,附于) fasten; append; add on; secure to something

affluence:   (富足,财富) abundance; a plentiful supply of material goods; wealth

affluent:   (富有的,丰富的) having an abundant supply of money or possessions of value

affront:   (侮辱,冒犯,蓄意蔑视) insult; offense; intentional act of disrespect

agenda:   (议程) items of business at a meeting; list or program of things to be done or considered

agglomeration:   (聚集,累积) collection; heap; act or process of gathering into a mass

aggrandize:   (增加,加强) increase scope of; extend; intensify; make greater in power, influence, stature, or reputation

aggravating:   (恼人的,讨厌的) irritating; annoying; making worse or more heinous

aggregate:   (收集,聚集) gather into a mass, sum, or whole; amount to

aggressive:   (强有力的,坚持己见的) making assaults; unjustly attacking; combative; hostile; tending to spread quickly

aggressiveness:   (侵略,争斗) feeling of hostility that arouses thoughts of attack; quality of being bold and enterprising

aghast:   (吓坏了的) struck by shock, terror, or amazement

agility:   (敏捷) mentally quick; moving quickly and lightly

agitate:   (激怒,打扰) cause to move with violence or sudden force; upset; disturb

agitation:   (焦虑,不安,鼓动,煽动) anxiety; extreme emotional disturbance

agnostic:   (无神论者) one who is skeptical of existence of a god or any ultimate reality

agrarian:   (耕地的,耕种的) pertaining to land or its cultivation; relating to agricultural or rural matters

ajar:   ((门窗等)微开的) half-open; slightly turned or opened

alacrity:   (欢快的情绪) cheerful promptness or willingness; eagerness; speed or quickness

alchemy:   (炼金术士) medieval chemistry; magical or mysterious power or process of transforming

alcove:   (小隔间,壁橱) nook; small, recessed section of a room

algorithm:   (算法) established procedure for solving problem

alien:   (外国的,外国人的,来自其他星球的) dissimilar, inconsistent, or opposed in nature; very different place, society, or person

alimentary:   (营养的) providing nourishment; concerned with food, nutrition, or digestion

allay:   (平静下来,（使）冷静下来) calm; pacify; reduce the intensity of; relieve

allege:   (断言) state without proof; assert to be true

allegory:   (寓言) symbolic representation of abstract ideas or principles in narrative, dramatic, or pictorial form

alliteration:   (头韵) repetition of beginning sound in poetry

allocate:   (分配,制定) assign; distribute according to plan

allude:   (暗指) refer casually or indirectly, or by suggestion

allusion:   (暗指,暗示) indirect reference; symbolical reference or comparison; metaphor

aloft:   (向上) in or into a high place; high or higher up

alternate:   (交替的,轮流的) happening or following in turns; succeeding each other continuously; substitute

altitude:   (高度) elevation especially above sea level; height

altruistic:   (无私的,关心他人的) unselfishly generous; concerned for others

amalgamate:   (结合,整合) combine; unite in one body; mix or alloy a metal with mercury

amass:   (收集) collect; gather for oneself, as for one's pleasure or profit

ambidextrous:   (双手都灵巧) capable of using either hand with equal ease

ambience:   (环境) particular environment or surrounding influence; atmosphere of environment

ambiguous:   (模棱两可) unclear or doubtful in meaning

ambivalence:   (矛盾的观点或情绪) state of having contradictory or conflicting emotional attitudes, such as love and hate

amble:   (漫步,缓行) moving at an easy pace; walk slowly or leisurely

ambulatory:   (可移动的,不固定) able to walk; formed or adapted for walking; not stationary

ameliorate:   (提高) make or become better; improve; grow better

amenable:   (有服从义务的,随时服从的) responsive to advice or suggestion; responsible to higher authority; willing to comply with; agreeable

amenities:   (令人愉快的,礼貌的) convenient features; courtesies

amiable:   (可爱的,友好的,惬意的) good-natured and likable; lovable; warmly friendly

amicable:   (温和的,友好礼貌的) exhibiting friendliness or goodwill; not quarrelsome

amid:   (在…中) in the middle of; among; surrounded by

amity:   (友谊) friendship; peaceful relations, as between nations

amorous:   (爱情的) moved by sexual love; loving

amorphous:   (无形的,不成形的) formless; lacking shape or definition

amphibian:   (两栖的) able to live both on land and in water

amphitheater:   (椭圆形的剧院,斗兽场) oval building with tiers of seats from central open space or arena

amplify:   (放大) broaden or clarify by expanding; intensify; make larger or more powerful; increase

amputate:   (截肢,切除) cut off part of body, especially by surgery; prune

anachronistic:   (时代错误) having time error in story; erroneous in date; in wrong time

analgesic:   (止痛的) serving to reduce sensibility to pain without loss of consciousness

analogous:   (类似的) comparable; similar or alike

anarchist:   (无政府主义者) person who seeks to overturn established government; advocate of abolishing authority

anathema:   (诅咒) solemn curse; someone or something regarded as a curse

ancestor:   (祖先,祖宗) forefather; forebear; forerunner or predecessor

ancestry:   (祖先) family descent; series or line of ancestors; lineage

ancillary:   (辅助的) serving as aid or accessory; auxiliary

anecdotal:   (轶闻的,多轶闻趣闻的) having the character of an anecdote; of short story of interesting or humorous incident

angular:   (有尖角的,瘦骨嶙峋的) sharp-cornered; consisting of an angle or angles; stiff in manner

animate:   (活的,有生命的) endowed with life; alive; living; animated

animated:   (活跃的,有生气的) having life or vigor or spirit; filled with activity; in form of cartoon

animus:   (敌意) feeling of enmity or ill will; attitude that informs one's actions; disposition

annals:   (记录,历史) chronological record of the events of successive years

annihilate:   (毁灭,破坏) destroy completely; reduce to nonexistence

annotate:   (评论,注释) comment; make explanatory notes

announce:   (宣布,发表,通告) herald; give out; proclaim; make known publicly

announcement:   (宣告,发表) formal public statement; act of making known publicly

annoy:   (使恼怒,打扰) disturb, especially by minor irritations; irritate

annuity:   (年金,养老金) annual payment of allowance or income; periodical payment, amounting to a fixed sum in each year

annul:   (避免) make or declare void or invalid; reduce to nothing

anodyne:   (止痛药,起安慰作用的事物) source of relaxation or comfort; medicine that relieves pain

anoint:   (神圣化) apply oil or similar substance to; put oil on during religious ceremony as a sign of sanctification or consecration.

anomalous:   (不正常的,变态的) deviating from normal or common order, form, or rule

anomaly:   (不规则,异常,反常) irregularity; person or something that is unusual; departure from normal or common order

anonymous:   (匿名的) having no name; having unknown or unacknowledged name

antagonism:   (反抗,敌对) active resistance; condition of being an opposing principle, force, or factor

antecede:   (先于) precede; go before in time, and sometimes in place, rank, or logical order

antecedents:   (历史环境,历史背景) preceding events or circumstances that influence what comes later; ancestors or early background

antediluvian:   (远古,上古,及其久远) antiquated; extremely old and ancient; belonging to very ancient times

anthology:   (选集) book of literary selections by various authors

anthropocentric:   (人类中心说) regarding human beings as the center of the universe

anthropoid:   (类人的) manlike; resembling a human, especially in shape or outward appearance

anthropomorphic:   (人形的) having human form or characteristics

anticlimax:   (反高潮,突降) letdown in thought or emotion; decline viewed in disappointing contrast with previous rise

antipathy:   (反对,厌恶) strong feeling of aversion; dislike

antithesis:   (对立面) contrast; direct contrast; opposition

anxious:   (渴望的,担忧的) eager; keen; worried; uneasy and apprehensive about an uncertain event or matter

apathy:   (漠不关心) lack of caring; indifference

aperture:   (洞,穴,孔) opening; diameter of such an opening; hole

apex:   (高点,顶点,高潮) highest point; vertex; summit; climax

aphasia:   (失声) loss of speech due to injury or illness

aphorism:   (格言,警句,谚语) definition or concise statement of principle; tersely phrased statement of truth or opinion

apiary:   (蜂房) place where bees and beehives are kept, especially where bees are raised for their honey

aplomb:   (沉着,垂直) poise; self-confident assurance

apocryphal:   (假的,捏造的) untrue; of questionable authorship or authenticity; erroneous; fictitious

apogee:   (顶点) the highest point; point in orbit most distant from the body being orbited

apolitical:   (不问政治的) having aversion or lack of concern for political affairs

apologist:   (辩护者) person who argues in defense or justification of something, such as doctrine, policy, or institution

apostate:   (变节者,脱党者,叛徒) one who abandons his religious faith or political beliefs

apotheosis:   (神圣,典范) elevation to godhood; fact or action of becoming a god; an ideal example of something

appall:   (使惊慌,震惊) depress or discourage with fear; grow faint or become weak

apparition:   (鬼,幽灵) ghostly figure; sudden or unusual sight; appearance; state of being visible

appellation:   (名字,标题) name; title; act of naming; act of appealing for aid, sympathy

append:   (追加,附上) attach; add as supplement or appendix

appliance:   (用具,器具) durable goods for home or office use; device or instrument for household use

apply:   (应用,适用) exert; put into service; avail oneself to;

apportion:   ((按比例或计划)分配) distribute; allot; give out as one's portion or share

apposite:   (合适的) strikingly appropriate and relevant; well-suited

appraise:   (估价) estimate value of; evaluate, especially in official capacity

apprehension:   (害怕) fearful or uneasy anticipation of the future; act of seizing or capturing; understanding

apprenticeship:   (学徒身份) term during which one learns a trade from skilled worker; service or legal condition of an apprentice

apprise:   (告诉) inform; give notice to; make aware

approaching:   (接近的,逼近的) impending; of the relatively near future; coming closer to another

approbation:   (同意,批准) expression of warm approval; praise

appropriation:   (拨款) funding; money set aside for a specific purpose

apropos:   (关于) with reference or regard; in respect

aptly:   (适当地,得体地) in a competent capable manner; in an apt or suitable manner

aquatic:   (与水有关系的) consisting of, relating to, or being in water

aquiline:   (弯曲的,钩状的) curved or hooked like an eagle's beak

arable:   (可耕种的) fit for growing crops, as by plowing

arbiter:   (仲裁者) person with power to decide a dispute; judge

arboretum:   (植物园) place where different tree varieties are exhibited

arcane:   (秘密,谜) secret; mysterious; known only to the initiated

archaeology:   (考古学) study of artifacts and relics of early mankind

archaic:   (过时的) no longer current or applicable; antiquated

archetype:   (原形) prototype; original model or type after which other similar things are patterned

archipelago:   (群岛) group of closely located islands

architecture:   (建筑,建筑学) art and science of designing and erecting buildings; buildings and other large structures

ardent:   (热心的,热情的) displaying or by strong enthusiasm or devotion; passionate

arduous:   (努力,奋发) demanding great effort or labor; difficult

arid:   (荒芜的) dry; lacking moisture, especially having insufficient rainfall to support trees or plants

aristocracy:   (贵族) hereditary nobility; privileged class

armada:   (舰队) a fleet of warships; a large group of moving things

aroma:   (香气,芬芳,芳香) fragrance; scent; pleasant characteristic odor, as of a plant, spice, or food

aromatic:   (芬芳的) fragrant or sweet-smelling; caused by fragrant odor

arousal:   (觉醒,激励) act of awaking from sleep; arousing from what is like sleep

arouse:   (刺激,激起,唤醒) excite; stimulate; awaken from or as if from sleep

arraign:   (传讯,责问) officially charge someone in a court of law

arrears:   (欠债) being in debt; unpaid, overdue debt or an unfulfilled obligation

arrogate:   (非法霸占,僭越) claim without justification; claim for oneself without right

arroyo:   (干枯的河床) deep gully; a dry gulch; brook or creek; watercourse

arthritis:   (关节炎) inflammation of a joint or joints

article:   (论文,文章) essay; editorial; individual thing or element of a class

articulate:   (清晰流畅的) expressing oneself easily in clear and effective language

artifice:   (技巧,欺骗) subtle but base deception; trickery; cleverness or skill; ingenuity

artisan:   (工匠) manually skilled worker; craftsman, as opposed to artist

artless:   (坦诚,直率) free of artificiality; natural; open and honest

ascendancy:   (统治,控制) superiority or decisive advantage; domination

ascetic:   (苦行,禁欲) leading a life of self-discipline and self-denial; austere

ascribe:   (归因于,指派) inscribe or dedicate; attribute to a specified cause, source, or origin; assign as a quality

aseptic:   (抗菌的) preventing infection; having cleansing effect

ashen:   (灰色) ash-colored; very pale; consisting of ashes

askance:   (瞄,斜视) with sideways or indirect look; Turned to side, especially of eyes

askew:   (歪斜) turned or twisted toward one side; at an angle

aspect:   ((问题的)方面,(事物的)一部分) distinct feature or element in a problem; a way in which something can be viewed by the mind

asperity:   (严酷,粗暴) sharpness of temper; roughness or harshness, as of surface, sound, or climate

aspirant:   (有志者,有抱负的人) one who aspires, as to advancement, honors, or a high position

assail:   (攻击) assault; attack with or as if with violent blows

assay:   (分析,化验) analyze; evaluate; examine by trial or experiment; put to test

assembly:   (集会,参加集会的人们) gathering; meeting; a group of persons gathered together for common reason

assent:   (同意,接受) express agreement to what is alleged or proposed; accept

assiduous:   (勤奋) constant in application or attention; diligent; unceasing or persistent

assimilate:   (吸收,同化) incorporate and absorb into mind; make similar; cause to resemble

assist:   (援助,帮助) give help or support to, especially as a subordinate

assistant:   (助手,助教) helper; person who assists or helps someone else

assuage:   (缓和,减轻) ease or lessen pain; satisfy or appease

astigmatism:   (散光) eye defect that prevents proper focus

astringent:   (收敛的) causing contraction; having the effect of drawing tissue together; stern or austere

astronomical:   (巨大,广阔) enormously large or extensive; relating to astronomy

asunder:   (分裂,分开) into separate parts or pieces; apart

asymmetric:   (不对称) not identical on both sides of a dividing central line

atavism:   (反祖,隔代遗传) resemblance to remote ancestors rather than to parents; deformity returning after passage of two or more generations

atavistic:   (复古的,从前的) displaying characteristics of previous cultural era or of previous ancestral form

atheistic:   (无神论) denying existence of God; godless

atrocity:   (暴行) brutal deed; atrocious condition, quality, or behavior; monstrousness

atrophy:   (枯萎,萎缩,衰退,结束) wasting away; decrease in size; reduction in the functionality of an organ caused by disease

attach:   (系,缚,附加) fasten; annex; be in contact with

attached:   (附加的,附属的) fastened together; joined by wall, especially by sharing a wall with another building; not freestanding

attainment:   (成就) something, such as an accomplishment or achievement; achievement

attenuate:   (削弱) make slender, fine, or small; weaken; lessen density of

attorney:   (代理人,辩护律师) lawyer; one who is appointed by another to act in his place or stead; proxy

attract:   (吸引,引起注意) draw to, or cause to tend to; engage or fix, as the mind, attention; invite or allure

attribute:   (属性,声望) essential quality; reputation; honor

attrition:   (裁员,磨损) gradual decrease in numbers; reduction in work force without firing employees; wearing away of opposition by means of harassment

atypical:   (非正常的,不正常) not normal; unusual or irregular; not representative of a group, class, or type

audacious:   (大胆的,鲁莽的) fearlessly, often recklessly daring; bold

audit:   (核算,稽核) examination of accounts; adjustment or correction of accounts

auditory:   (听觉的) of or relating to hearing, the organs of hearing, or the sense of hearing

auger:   (螺丝钻,钻孔机) hand tool for boring holes; hollow drill used to take core samples of soil, ice

augment:   (增长) make greater, as in size, extent, or quantity

augury:   (占卜,预言) sign of something coming; art or practice of foretelling events by signs or omens

aureole:   (日冕) the outermost region of the sun's atmosphere; halo

auroral:   (曙光的,极光的) characteristic of dawn; dawning, eastern, like new beginning; relating to the atmospheric phenomenon auroras

auspicious:   (幸运的,吉祥的) attended by favorable circumstances; marked by success; prosperous

austere:   (严厉的,朴素的) strict or severe in discipline; severely simple and unornamented

authenticate:   (鉴别) prove genuine; establish authenticity of

authoritarian:   (独裁) expecting absolute obedience; completely dominating another's will

authoritative:   (权威,独裁) having weight of authority; peremptory and dictatorial

authority:   (权力,权限,权威人士) jurisdiction; power to enforce laws, exact obedience, command, determine, or judge; government

authorize:   (授权,批准) empower; give permission for; sanction

autocrat:   (独裁者,专横霸道的人) dictator; ruler having unlimited power

autocratic:   (独裁) having absolute, unchecked power; dictatorial

automaton:   (机器人) mechanism that imitates actions of humans

autonomous:   (自治) self-governing; not controlled by others or by outside forces; independent

autonomy:   (自治,自治权) independence; self-government or the right of self-government; self-determination

auxiliary:   (辅助的) helper, additional or subsidiary

avalanche:   (雪崩) great mass of falling snow and ice

avarice:   (贪婪,贪财) greediness for wealth; insatiable desire of gain

aver:   (断言,声明,证明) declare to be true; affirm

averse:   (反对的) reluctant; disinclined; turned away or backward; unwilling

aversion:   (厌恶,抵制) firm dislike; turning away; avoidance of a thing, situation, or behavior because of dislike

aviary:   (大鸟笼,鸟舍) large cage, building, or enclosure in which birds are reared or kept

aviation:   (航空,航空学) art or science of flying; flight; aeronautics

avid:   (贪婪) greedy; eager for; marked by keen interest and enthusiasm

avocation:   (副业,业余爱好) activity taken up in addition to one's regular work or profession, usually for enjoyment

avoidance:   (避免) keeping away from or preventing from happening

avow:   (宣布) declare openly; acknowledge openly, boldly, and unashamedly

avuncular:   (像伯父（叔叔）一样的) in manner of uncle, pertaining to uncle; kind, genial, benevolent or tolerant

awkwardly:   ((见到生人)局促不安地,笨拙地) in an uncomfortable, nervous or embarrassed way

awry:   (扭曲的,歪曲的) in a position that is turned toward one side; away from correct course

axiom:   (公理,自明的道理) self-evident truth requiring no proof

azure:   (天蓝) sky blue; light purplish-blue