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facultative

/ˈfæ.kəl.tə.tɪv/ adjective

adjective Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about facultative at Wordnik → Where our words come from →

  1. Of or relating to faculty, especially to mental faculty.
  2. Not obligate; optional, discretionary or elective.
  3. That grants permission or power to do something.

Origin

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

From Wiktionary, via Kaikki.org (CC BY-SA)