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Meaning of onanism

o•nan•ism

Pronunciation: (ō'nu-niz"um), [key]
— n.
  1. withdrawal of the penis in sexual intercourse so that ejaculation takes place outside the vagina; coitus interruptus.
  2. masturbation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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