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's Dictionary 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.