Noun onanism has 2 senses
  1. masturbation, onanism, self-abuse - manual stimulation of the genital organs (of yourself or another) for sexual pleasure
    --1 is a kind of autoeroticism, autoerotism
    --1 has particulars: frottage; jacking off, jerking off, hand job, wank
  2. coitus interruptus, withdrawal method, pulling out, onanism - a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
    --2 is a kind of birth control, birth prevention, family planning
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