From Longman Dictionary of Contemporary EnglishSunniSun‧ni /ˈsʊni, ˈsʌni/ noun [countable] RRIa Muslim who follows one of the two main branches of the Muslim religion → Shiite
Examples from the Corpus
Sunni• This is a fundamental difference between Sunni and Shita.• The three remaining Sunni factions were said to be refusing to talk to Kabul.Origin Sunni (1500-1600) Arabic sunniy, from sunnah; → SUNNA 