accretion (n.) Look up accretion at Dictionary.com
1610s, "act of growing by organic enlargement;" 1650s as "that which is formed by continued growth from without," from Latin accretionem (nominative accretio) "an increasing, a growing larger" (as of the waxing moon), noun of action from past participle stem of accrescere "grow progressively, increase, become greater," from ad "to" (see ad-) + crescere "grow" (see crescent). It goes with the verb accrue. Related: Accretional; accretionary.