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/ˌtwɛntiˈwʌn/ · numeral
The cardinal number occurring after twenty and before twenty-two, represented in Roman numerals as XXI and in Arabic numerals as 21..
They were to spend many an evening together sitting round the old kitchen table playing twentyone ….
Use twenty-one when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Twenty-one means The cardinal number occurring after twenty and before twenty-two, represented in Roman numerals as XXI and in Arabic numerals as 21..
Common synonyms include eleventeen, one and twenty, 21, XXI.
The opposite depends on the specific sense.
They were to spend many an evening together sitting round the old kitchen table playing twentyone ….
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