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From The Collaborative International Dictionary of English v.0.48:
orgasm \or"gasm\ ([^o]r"g[a^]z'm), n. [F. orgasme; cf. Gr. 'orgasmo`s a kneading, softening, prob. confused with 'orga^n to swell, especially with lust; to feel an ardent desire.] (Physiol.) Eager or immoderate excitement or action; the state of turgescence of any organ; erethism. [1913 Webster] 2. Especially: The peak of the physical pleasurable sexual excitement caused by stimulation of the sexual organs, as in intercourse; in the male, it is usually accompanied by ejaculation. [1913 Webster +PJC] 3. Hence: An eruption of intense, uncontrolled excitement; -- used of groups and individuals. [PJC]