Source : Webster's Revised Unabridged Dictionary (1913)

Factoring \Fac"tor*ing\, n. (Math.)
   The act of resolving into factors.

Factor \Fac"tor\, v. t. [imp. & p. p. {Factored} (-t?rd); p. pr.
   & vb. n. {Factoring}.] (Mach.)
   To resolve (a quantity) into its factors.

Source : WordNet®

factoring
     n : (mathematics) the resolution of an integer or polynomial
         into factors such that when multiplied together they give
         the integer or polynomial [syn: {factorization}, {factorisation}]