Etymology
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ninety (adj., n.)

"9 times ten; the number which is one more than eighty-nine or 10 less than one hundred; a symbol representing this number;" Middle English nīntī (late 13c.), from Old English nigontig, from nine + -tig "group of ten" (see -ty (1)). Cognate with Old Frisian niontich, Middle Dutch negentich, Dutch negentig, German neunzig, Old Norse nintigir.

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Definitions of ninety
1
ninety (n.)
the cardinal number that is the product of ten and nine;
Synonyms: " / xc
2
ninety (adj.)
being ten more than eighty;
Synonyms: " / xc
From wordnet.princeton.edu