Etymology

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Today it means: Based upon the number nineteen. Full definition →

Latin ūndēvīcēsimus
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The story

  1. Latin · borrowed fromūndēvīcēsimus“nineteenth”
  2. English todayundevicesimal

From Latin ūndēvīcēsimus (“nineteenth”) + -al.

Etymology from Wiktionary, CC BY-SA 4.0.