Etymology
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accumulation (n.)

late 15c., "that which is heaped up, an accumulated mass," from Latin accumulationem (nominative accumulatio) "a heaping up," noun of action from past-participle stem of accumulare "to heap up, amass," from ad "to," here perhaps emphatic (see ad-), + cumulare "heap up," from cumulus "heap" (from suffixed form of PIE root *keue- "to swell"). Meaning "act of heaping up" is from c. 1600.

Origin and meaning of accumulation
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Definitions of accumulation

accumulation (n.)
an increase by natural growth or addition;
Synonyms: accretion
accumulation (n.)
several things grouped together or considered as a whole;
accumulation (n.)
the act of accumulating;
Synonyms: accrual / accruement
accumulation (n.)
(finance) profits that are not paid out as dividends but are added to the capital base of the corporation;
From wordnet.princeton.edu