accretion

1 a mass or quantity that has piled up or that has been gathered over a period of time a thick accretion of ice in a freezer that obviously had not been cleaned for some time Synonyms of accretion accumulation, assemblage, collection, cumulation, cumulus, gathering, lodgment (or lodgement), pileupWords Related to accretion 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 something added (as by growth) accretions of lime have thickened the cave's stalactites and stalagmites over the centuries Synonyms of accretion increase, accrual, addendum, addition, augmentation, boost, expansion, gain, increment, more, plus, proliferation, raise, rise, step-up, supplement, uptickWords Related to accretion accumulation, assemblage, collection, gathering; complement; accession, appendix, continuation, extension, uptrend, upturn; jump, run-up, spikeNear Antonyms of accretion deduction, subtractionAntonyms of accretion abatement, decline, decrease, decrement, depletion, diminishment, diminution, drop-off, fall, falloff, lessening, loss, lowering, reduction, shrinkage, step-down