Ido numbers (edit)
10
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    Cardinal: un
    Ordinal: unesma
    Adverbial: unfoye
    Multiplier: unopla
    Fractional: unima

Etymology

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un (one) +‎ foyo (time) +‎ -e (compare Esperanto unufoje)

Adverb

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unfoye

  1. once (one time)