1. accumulate, amass. cumulatecumu*late (k?m?-l?t), v. t. [imp. & p. p. cumulated (-l?`t?d); p. pr. & vb. n. cumulating (-l?`t?ng).] [l. cumulatus, p. p. of cumulare to heap up, fr. cumulus a heap. see: cumber.] to gather or throw into a heap; to heap together; to accumulate. shoals of shells, bedded and cumulated heap upon heap