Etymology

facultative

fac·ul·ta·tive
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Today it means: Of or relating to faculty, especially to mental faculty. Full definition →

French facultatif
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The story

  1. French · borrowed fromfacultatif
  2. English todayfacultative

From French facultatif. By surface analysis, faculty + -ative.

Etymology from Wiktionary, CC BY-SA 4.0.