Source : Webster's Revised Unabridged Dictionary (1913)

Suicide \Su"i*cide\, n. [L. sui of one's self (akin to suus
   one's own) + caedere to slay, to kill. Cf. {So}, adv.,
   {Homicide}.]
   1. The act of taking one's own life voluntary and
      intentionally; self-murder; specifically (Law), the
      felonious killing of one's self; the deliberate and
      intentional destruction of one's own life by a person of
      years of discretion and of sound mind.

   2. One guilty of self-murder; a felo-de-se.

   3. Ruin of one's own interests. ``Intestine war, which may be
      justly called political suicide.'' --V. Knox.

Source : WordNet®

suicide
     n 1: the act of killing yourself; "it is a crime to commit
          suicide" [syn: {self-destruction}, {self-annihilation}]
     2: a person who kills himself intentionally [syn: {felo-de-se}]