twelvefold

[adjective twelv-fohld; adverb twelv-fohld]
adjective
  1. having twelve sections, aspects, divisions, kinds, etc.
  2. being twelve times more, larger, greater, etc., as a given quantity size, intensity, or the like.
adverb
  1. twelve times in amount or degree: Its potential destructive power was increased twelvefold.

Origin of twelvefold

First recorded in 1550–60, twelvefold is from the Old English word twelf-feald. See twelve, -fold
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of twelvefold