Pronunciation: (mas"tur-bā'shun), [key]
1. the stimulation or manipulation of one's own genitals, esp. to orgasm; sexual self-gratification.
2. the stimulation, by manual or other means exclusive of coitus, of another's genitals, esp. to orgasm.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.