1. (n.) The act of accumulating, the state of being accumulated, or that which is accumulated; as, an accumulation of earth, of sand, of evils, of wealth, of honors.

2. (n.) The concurrence of several titles to the same proof.

abundance access accession accretion accrual accruement acervation addition advance agglomerate agglomeration aggrandizement aggregate aggregation amassing amassment amplification appreciation ascent assemblage assembling augmentation backlog ballooning bank bloating boom boost bringing together broadening budget buildup chunk collecting collection colluvies commissariat commissary congeries conglobation conglomerate conglomeration cornucopia crescendo cumulation cumulus development dump edema elevation enlargement expansion extension flood gain gathering gleaning glomeration gob greatening growth gush heap hike hoard hunk increase increment inflation inventory jump larder leap lump mass material materials materiel mounting multiplication munitions pile piling plenitude plenty productiveness proliferation provisionment provisions raise rations repertoire repertory reserve rick rise snowball snowballing spread stack stock stock-in-trade stockpile store stores supplies supply on hand surge swelling treasure treasury trove tumescence up upping upsurge upswing uptrend upturn wad waxing widening