Source : Webster's Revised Unabridged Dictionary (1913)

Orgasm \Or"gasm\, n. [F. orgasme; cf. Gr. ? a kneading,
   softening, prob. confused with ? to swell, espicially with
   lust; to feel an ardent desire.] (Physiol.)
   Eager or immoderate excitement or action; the state of
   turgescence of any organ; erethism; esp., the height of
   venereal excitement in sexual intercourse.

Source : WordNet®

orgasm
     n : the moment of most intense pleasure in sexual intercourse
         [syn: {climax}, {sexual climax}, {coming}]