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Definitions of facultative
  1. adjective
    not compulsory

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  2. adjective
    able to exist under more than one set of conditions
    "a facultative parasite can exist as a parasite or a saprophyte"
    Opposite:
  3. adjective
    granting a privilege or permission or power to do or not do something
    "a facultative enactment"

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  4. of or relating to the mental faculties
Examples of facultative
  • "a facultative parasite can exist as a parasite or a saprophyte"
  • "a facultative enactment"
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