/ Dictionary / Index S subincision: Meaning and Definition of Find definitions for: sub•in•ci•sion Pronunciation: (sub"in-sizh'un), [key] — n. the slitting of the underside of the penis to the urethra, performed as a puberty rite among some tribal peoples, esp. in Australia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subhuman subindex Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language