/ Dictionary / Index S Sunni: Meaning and Definition of Find definitions for: Sun•ni Pronunciation: (soon'ē), [key] — n. Islam. Also calleda member of one of the two great religious divisions of Islam, regarding the first four caliphs as legitimate successors of Muhammad and stressing the importance of Sunna as a basis for law. Cf. the Sunni Muslims. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sunni (Thesaurus) Sunna Sunnite Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language