Serbo-Croatian

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Serbo-Croatian numbers (edit)
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    Cardinal: petnaest
    Ordinal: petnaesti
    Multiplier: petnaestostruk
    Collective: petnaestoro, petnaestorica
    Fractional: petnaestina

Etymology

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From pȇt (five) +‎ na (on) +‎ dȅset (ten). Cognates include Slovene petnájst.

Numeral

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pètnaēst (Cyrillic spelling пѐтнае̄ст)

  1. fifteen

Usage notes

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This number is indeclinable. It governs the genitive plural of the noun.