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/ˈnaɪn.ti/ · numeral
The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90..
Use ninety when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ninety means The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90..
Common synonyms include 90, XC, cardinal, xc.
The opposite depends on the specific sense.
Use ninety where its definition matches the intended context.
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