facultative

Definitions of facultative
  1. adjective
    of or relating to the mental faculties
  2. adjective
    granting a privilege or permission or power to do or not do something
    “a facultative enactment”
    Synonyms:
    enabling
    providing legal power or sanction
  3. adjective
    able to exist under more than one set of conditions
    “a facultative parasite can exist as a parasite or a saprophyte”
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    Antonyms:
    obligate
    restricted to a particular condition of life
  4. adjective
    not compulsory
    facultative courses in the sciences”
    Synonyms:
    optional
    possible but not necessary; left to personal choice
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