nineties


Concise Oxford English Dictionary © 2008 Oxford University Press:
ninety/ˈnʌɪnti/
cardinal number (pl. nineties) equivalent to the product of nine and ten; ten less than one hundred; 90. (Roman numeral: xc or XC)
– derivatives
ninetieth ordinal number,
ninetyfold adjective & adverb.
– origin OE nigontig (see nine, -ty2).
'nineties' also found in these Oxford entries:

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