/ Dictionary / Index S sibling: Meaning and Definition of Find definitions for: sib•ling Pronunciation: (sib'ling), [key] — n. a brother or sister. a comember of a sib. —adj. of or pertaining to a brother or sister: sibling rivalry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sibling (Thesaurus) Sibiu sibship Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language