Accumulate \Ac*cu"mu*late\, v. t. [imp. & p. p. {Accumulated}; p. pr. & vb. n. {Accumulating}.] [L. accumulatus, p. p. of accumulare; ad + cumulare to heap. See {Cumulate}.] To heap up in a mass; to pile up; to collect or bring together; to amass; as, to accumulate a sum of money. [1913 Webster] Syn: To collect; pile up; store; amass; gather; aggregate; heap together; hoard. [1913 Webster]