/ Dictionary / Index S sinfonia: Meaning and Definition of Find definitions for: sin•fo•ni•a Pronunciation: (sin"fō-nē'uIt.sēn"fô-nē'ä), [key] — pl. -ni•as, -ni•e a symphony. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sinfjotli sinfonietta 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