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.
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nineties
n 1: the decade from 1890 to 1899 [syn: 1890s]
2: the decade from 1990 to 1999 [syn: 1990s]
3: the time of life between 90 and 100 [syn: mid-nineties]