"collected into a mass or quantity," 1690s, past-participle adjective from accumulate (v.). The earlier adjective was accumulate (1530s, from Latin past participle accumulatus).
Entries linking to accumulated
accumulate v.
1520s, "to heap up" (transitive), from Latin accumulatus, past participle 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"). From 1759 in intransitive sense of "grow in size or number." Related: Accumulated; accumulating.