/ Dictionary / Index S Sibelius: Meaning and Definition of Find definitions for: Si•be•li•us Pronunciation: (si-bā'lē-us, -bāl'yus Fin. si-bā'ly&oobreves), [key] 1865–1957, Finnish composer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sibelius (Thesaurus) sib Siberia Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language