accumulation

1 a mass or quantity that has piled up or that has been gathered over a period of time a vast accumulation of evidence about the dangers of smoking Synonyms accretion, assemblage, collection, cumulation, cumulus, gathering, lodgment (or lodgement), pileup Related Words agglomerate, assortment, congeries, conglomerate, conglomeration, hodgepodge, hotchpotch, jumble, medley, mélange, mishmash, mix, mixture, motley, potpourri; agglomeration, clutter, hash, heap, litter, mass, pile; aggregate, aggregation, sum, totality; backlog, cache, fund, hoard, inventory, kitty, nest egg, reserve, stock, stockpile, store, supply

2 the act or process of becoming greater in number the accumulation of leaves on the ground is proceeding at a much faster rate than my raking Synonyms accumulating, multiplication, addition, increase, mushrooming, proliferationRelated Words doubling, quadrupling, tripling; creep, growth, rise, spread; enlargement, escalation, expansion; amplification, distension (or distention), inflation; accretion, accrual, augmentation, cumulation; extension, lengthening; boost, gain, hike, increment, riseNear Antonyms abatement, compressing, compression, condensation, condensing, constricting, constriction, contracting, contraction, diminishing, diminishment, diminution, drop, drop-off, fall, falloff, lessening, lowering, reduction, shrinkage, shrinking; retrenching, retrenchment, shorteningAntonyms decrease