Source : Webster's Revised Unabridged Dictionary (1913)

Accrementition \Ac`cre*men*ti"tion\, n. [See {Accresce},
   {Increment}.] (Physiol.)
   The process of generation by development of blastema, or
   fission of cells, in which the new formation is in all
   respect like the individual from which it proceeds.