/ Dictionary / Index S sleeping: Meaning and Definition of Find definitions for: sleep•ing Pronunciation: (slē'ping), [key] — n. the condition of being asleep. —adj. asleep. of, pertaining to, or having accommodations for sleeping: a sleeping compartment. used to sleep in or on: a sleeping jacket. used to induce or aid sleep or while asleep: sleeping mask. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sleeping (Thesaurus) sleep-in sleeping bag Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language