Etymology
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cumulative (adj.)

c. 1600, "formed by adding to, increasing inorganically" (a sense now obsolete), from Latin cumulatus, past participle of cumulare "to heap," from cumulus "heap" (from suffixed form of PIE root *keue- "to swell") + -ive. Meaning "increasing by successive additions" is from 1640s (implied in cumulatively).

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Definitions of cumulative

cumulative (adj.)
increasing by successive addition;
the benefits are cumulative
Synonyms: accumulative
From wordnet.princeton.edu