/ Dictionary / Index R RISC: Meaning and Definition of Find definitions for: RISC Pronunciation: (risk), [key] reduced instruction set computer: a computer whose central processing unit recognizes a relatively small number of instructions, which it can execute very rapidly. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: risc (Thesaurus) Rip Van Winkle rise Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language