Nine"ty (?), a. [See Nine, and cf. Forty.]
Nine times ten; eighty-nine and one more; as, ninety men.
© Webster 1913.
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.
© Webster 1913.