Ninety \Nine"ty\, a. [See Nine, and cf. Forty.] Nine times ten; eighty-nine and one more; as, ninety men.
Source: Webster's Revised Unabridged Dictionary (1913)
Ninety \Nine"ty\, n.; pl. Nineties.1. The sum of nine times ten; the number greater by a unit than eighty-nine; ninety units or objects.
2. A symbol representing ninety units, as 90 or xc.