Definition of masturbation
: erotic stimulation especially of one's own genital (see genital sense 2) organs commonly resulting in orgasm and achieved by manual (see manual entry 1 sense 1) or other bodily contact exclusive of sexual intercourse, by instrumental manipulation (see manipulate sense 1), occasionally by sexual fantasies, or by various combinations of these agencies
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Merriam-Webster unabridged
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Time Traveler for masturbation
The first known use of masturbation was in 1603
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