Source : Webster's Revised Unabridged Dictionary (1913)

Accumulation \Ac*cu`mu*la"tion\, n. [L. accumulatio; cf. F.
   accumulation.]
   1. 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. (Law) The concurrence of several titles to the same proof.

   {Accumulation of energy} or {power}, the storing of energy by
      means of weights lifted or masses put in motion;
      electricity stored.

   {An accumulation of degrees} (Eng. Univ.), the taking of
      several together, or at smaller intervals than usual or
      than is allowed by the rules.



   {Accumulation}, {Conservation}, {Correlation}, & {Degradation
   of energy}, etc. (Physics) See under {Accumulation},
      {Conservation}, {Correlation}, etc.

   Syn: Force; power; potency; vigor; strength; spirit;
        efficiency; resolution.

Source : WordNet®

accumulation
     n 1: an increase by natural growth or addition [syn: {accretion}]
     2: several things grouped together or considered as a whole
        [syn: {collection}, {aggregation}, {assemblage}]
     3: the act of accumulating [syn: {accrual}, {accruement}]
     4: (finance) profits that are not paid out as dividends but are
        added to the capital base of the corporation