—(US, colloquial) A girl's sixteenth birthday, or sixteenth-birthday party and a related coming of age party
Sweet SixteenproperNoun
—(basketball, US, informal) The sixteen teams participating in the regional semifinals of the NCAA Division I tournament, one of whom will become the national champion.—(basketball, US, informal) The round of the NCAA Division I basketball tournament where all but 16 teams have been eliminated.—(basketball, US, informal) An appearance in the Sweet Sixteen.