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." Shak.
"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.] Milton.
3. To geld. [Colloq.]
Syn. -- Change, Alter. 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.