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Adjective: facultative  'fa-kul,tey-tiv [N. Amer], fa-kul-tu-tiv [Brit]
  1. Of or relating to the mental faculties
  2. (biology) able to exist under more than one set of conditions
    "a facultative parasite can exist as a parasite or a saprophyte"
  3. Granting a privilege or permission or power to do or not do something
    "a facultative enactment"
  4. Not compulsory
    - elective

See also: enabling, optional

Antonym: obligate

Encyclopedia: Facultative