English

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English numbers (edit)
 ←  17 18 19  → 
    Cardinal: eighteen
    Ordinal: eighteenth
    Adverbial: eighteen times
    Multiplier: eighteenfold
    Germanic collective: eighteensome

Etymology

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From eighteen +‎ -fold.

Adjective

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eighteenfold (not comparable)

  1. By a factor of eighteen.

Adverb

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eighteenfold (not comparable)

  1. By a factor of eighteen.