Similar words: humanitarianism, humanism, satanism, paganism, organism, urbanism, mechanism, lutheranism. Meaning: ['əʊnənɪzm] 
n. 1. manual stimulation of the genital organs (of yourself or another) for sexual pleasure 2. a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation.
n. 1. manual stimulation of the genital organs (of yourself or another) for sexual pleasure 2. a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation. 
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1. Another word is onanism.
2. The story of Onan (Genesis 38:7-10) is always cited as an example of how God will punish masturbators; this is where we get the term "Onanism," which refers to masturbation.
3. Commentators questioned why the poorest region in Spain was paying for a campaign to promote onanism.
4. In a "Science" column first published last summer and reprinted below, Daniel Engber examined onanism across the animal kingdom.
5. My Slate colleague William Saletan points out that a recent paper has laid the groundwork for a pro-life defense of onanism.
6. Not so long ago, doctors gave dire warnings about masturbation, writing all manner of treatises on the vice of onanism and its physically deleterious effects.
More similar words: humanitarianism, humanism, satanism, paganism, organism, urbanism, mechanism, lutheranism, shamanism, brahmanism, utopianism, puritanism, organismal, americanism, bohemianism, hooliganism, sectarianism, confucianism, republicanism, vegetarianism, antinomianism, microorganism, price mechanism, egalitarianism, utilitarianism, zoroastrianism, totalitarianism, cosmopolitanism, organisational, authoritarianism.