Spelling.School · How to spell
How to spell twenty-first
What it means: Coming next after the twentieth in position.
In a sentence: Ella will celebrate her twenty-first birthday next week.
Same family: first, twenty-one, twenty-second, twenty-third, twenty. If you can spell one, the shared part carries to the others.
Where it comes from: The word "twenty-first" is a compound ordinal number formed from "twenty" (from Old English "twentig," meaning "two tens") and "first" (from Old English "fyrst," meaning "foremost" or "earliest"). English creates ordinals like this by combining a base number with an ordinal form, often using a hyphen.
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