Etymology
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masturbate (v.)

"produce an orgasm by stimulation of the genitals," 1839, a back-formation from masturbation, or else from Latin masturbatus, past participle of masturbari. The earlier form was mastuprate (17c.), for which see masturbation. Transitive use is by 1970. Related: Masturbated; masturbating.

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Definitions of masturbate

masturbate (v.)
stimulate sexually;
The old man wanted to be masturbated by the prostitute
masturbate (v.)
get sexual gratification through self-stimulation;
Synonyms: wank / fuck off / she-bop / jack off / jerk off
From wordnet.princeton.edu