"accumulation" in the noun sense
1. accretion, accumulation
an increase by natural growth or addition
2. collection, aggregation, accumulation, assemblage
several things grouped together or considered as a whole
3. accumulation, accrual, accruement
the act of accumulating
finance) profits that are not paid out as dividends but are added to the capital base of the corporation
Source: WordNet® (An amazing lexical database of English)
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