What does accumulate mean?
The definition of accumulate
Ac*cu”mu*late, v. t.
[imp. & p. p. Accumulated; p. pr. & vb. n.Accumulating.]
Etym: [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.

Synonyms
— To collect; pile up; store; amass; gather; aggregate; heap together; hoard.

Ac*cu”mu*late, v. i.
To grow or increase in quantity or number; to increase greatly. Ill fares the land, to hastening ills a prey, Where wealth accumulates, and men decay. Goldsmith.
Ac*cu”mu*late, a.
Etym: [L. accumulatus, p. p. of accumulare.]

Collected; accumulated. Bacon.