the physical and emotional sensation experienced at the peak of sexual excitation, usually resulting from stimulation of the sexual organ and usually accompanied in the male by ejaculation.
an instance of experiencing this.
intense or unrestrained excitement.
an instance or occurrence of such excitement.
verb (used without object)
to have an orgasm.

1640–50; < Neo-Latin orgasmus < Greek orgasmós, derivative of orgân to swell, be excited

orgasmic, orgastic, adjective
nonorgasmic, adjective
postorgasmic, adjective
postorgastic, adjective
superorgasm, noun

organism, orgasm. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
orgasm (ˈɔːɡæzəm)
1.  the most intense point during sexual excitement, characterized by extremely pleasurable sensations and in the male accompanied by ejaculation of semen
2.  rare intense or violent excitement
[C17: from New Latin orgasmus, from Greek orgasmos, from organ to mature, swell]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1680s, from Fr. orgasme, from Gk. orgasmos "excitement, swelling," from organ "be in heat, become ripe for," lit. "to swell, be excited," related to orge "impulse, excitement, anger," from PIE base *wrog- "to burgeon, swell with strength" (cf. Skt. urja "a nourishment, sap, vigor," O.Ir. ferc, ferg "anger").
The verb is attested from 1973, originally and usually in reference to a woman's sexual climax. Orgasmic is attested from 1935.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

orgasm or·gasm (ôr'gāz'əm)
The highest point of sexual excitement, marked by strong feelings of pleasure and marked normally by ejaculation of semen by the male and by vaginal contractions within the female. Also called climax.

or·gas'mic (ôr-gāz'mĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
orgasm   (ôr'gāz'əm)  Pronunciation Key 
The peak of sexual excitement, characterized by strong feelings of pleasure and bv a series of involuntary contractions of the muscles of the genitals, usually accompanied by the ejaculation of semen by the male.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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