Al·ter v. t. [imp. & p. p. Altered p. pr. & vb. n. Altering.]
  1. To make otherwise; to change in some respect, either partially or wholly; to vary; to modify.  “To alter the king's course.”  “To alter the condition of a man.”  “No power in Venice can alter a decree.”
     It gilds all objects, but it alters none.   --Pope.
     My covenant will I not break, nor alter the thing that is gone out of my lips.   --Ps. lxxxix. 34.
  2. To agitate; to affect mentally. [Obs.]
  3. To geld. [Colloq.]
  Syn: -- Change, Alter.
  Usage: Change is generic and the stronger term. It may express a loss of identity, or the substitution of one thing in place of another; alter commonly expresses a partial change, or a change in form or details without destroying identity.
  altering
       n : the sterilization of an animal; "they took him to the vet
           for neutering" [syn: neutering, fixing]