ninety

From Middle English nynety, ninty, nineti, nigneti, from Old English nigontiġ (also as hundnigontiġ (“ninety”)), from Proto-Germanic *newuntēhundą (“ninety”), equivalent to nine +‎ -ty. Cognate with Scots nynty, nynety (“ninety”), Saterland Frisian njuugentich (“ninety”), West Frisian njoggentich (“ninety”), Dutch negentig (“ninety”), German Low German negentig (“ninety”), German neunzig (“ninety”), Swedish nittio (“ninety”), Norwegian t-ninety, Icelandic níutíu (“ninety”).

• (Received Pronunciation) IPA^(key): /ˈnaɪn.ti/
• (General American) IPA^(key): /ˈnaɪn.di/, /ˈnaɪn.ti/

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ninety

1. The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90.

• Arabic numerals: 90
• Roman numerals: XC

• Ordinal: ninetieth

• Last: eighty-nine, eighty
• Next: ninety-one, hundred

• Tinney