a. increasing by successive addition
Vocabulary building is a cumulative process: as you go through your flash cards, you will add new words to your vocabulary, one by one.
"The Hobbit: An Unexpected Journey" had its trip to the number one spot cut short, falling to third place. The film earned $17.5 million, bringing its cumulative domestic grosses to $263.8 million.
Sentence in Classic:
The beaming sight, and the penetrating warmth, seemed to breed in him a cumulative cheerfulness, which soon amounted to delight.
Return of the Native By Thomas Hardy Context