Answer: Accumulation means two things. the acquisition or gradual gathering of something, or a mass or quantity of something that has gradually gathered or been acquired. Synonyms are:
amassing
building up
buildup
collection
gathering
assembling
assembly
stockpiling
hoarding
cumulation
accrual
amassment
mass
pile
heap
stack
stock
store
stockpile
reserve
hoard
bank
pool
fund
mine
reservoir
aggregation
accretion
agglomerate
agglomeration