| Noun | 1. | onanism - manual stimulation of the genital organs (of yourself or another) for sexual pleasure autoeroticism, autoerotism - using you own body as a sexual object self-abuse, self-stimulation - manual stimulation of your own genital organ for sexual pleasure frottage - masturbation by rubbing against another person (as in a crowd) |
| 2. | onanism - a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation |