01 n. pl. The decade from 1890 to 1899; as, the gay nineties.
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1.
The decade from 1890 to 1899; as, the gay nineties.
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2.
The decade from 1990 to 1999; as, they spent a ton of money to solve the Y2K bug in the nineties.
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3.
The time of life between ages 90 and 100.
Syn.
mid-nineties.