Welsh

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Welsh numbers (edit)
 ←  80  ←  89 90 91  →  100  → 
9
    Cardinal (decimal): naw deg, (optionally before a nasal or vowel) naw deng
    Cardinal (vigesimal): deg a phedwar ugain
    Ordinal: degfed a phedwar ugain
    Ordinal abbreviation: 90ain

Adjective

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90ain

  1. Abbreviation of degfed a phedwar ugain.: 90th