English edit

English numbers (edit)
 ←  14 15 16  → 
    Cardinal: fifteen
    Ordinal: fifteenth
    Adverbial: fifteen times
    Multiplier: fifteenfold
    Group collective: fifteensome

Etymology edit

fifteen +‎ -fold

Adjective edit

fifteenfold (not comparable)

  1. By a factor of fifteen.
    • 2007 July 5, Andrew Downie, “Loan Changes in Brazil Motivate New Buyers and Home Building”, in New York Times[1]:
      Rodobens, a provincial firm specializing in the lower-middle income bracket, has plans to build 10,000 homes a year over the next four years, a fifteenfold rise on its previous annual total.

Adverb edit

fifteenfold (not comparable)

  1. By a factor of fifteen.