Group (3) - Spelling Practices

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(1) ad. Syn. by chance; accidentally(кстати) by chance; accidentally
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(2) n. Syn. heritage(наследования) any attribute or immaterial possession that is inherited from ancestors 
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(3) n. (иона) a particle that is electrically charged positive or negative
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(4) n. Syn. mix(беспорядок) assemble without order or sense; confused multitude of things; chaos; mess; mixture
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(5) v. Syn. dawdle(задерживаться) be slow in leaving; continue or persist; stay
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(6) a. (таинственный) beyond ordinary understanding
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(7) n. (никеля) coin worth one twentieth of a dollar
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(8) v. Syn. darken; hide; block(неясным) darken; make dim or indistinct; conceal in obscurity
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(9) n. (опера) a drama set to music and consists of singing 
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(10) a. Syn. even; equal(параллельно) being an equal distance apart everywhere; having the same tendency or direction