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English numbers (edit)
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    Cardinal: eighty-one
    Ordinal: eighty-first

Determiner

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Determiner
eighty-one

  1. (number) (indefinite) (plural) (count) (ordinal eighty-first) Eighty-one (81) is the odd number that comes between eighty and eighty-two. It is a square number (9 multiplied by 9 equals 81).
    I have eighty-one coins in my collection.