Definitions of facultative:
- adjective: granting a privilege or permission or power to do or not do something
Example: "A facultative enactment"
- adjective: able to exist under more than one set of conditions
Example: "A facultative parasite can exist as a parasite or a saprophyte"
- adjective: of or relating to the mental faculties
- adjective: not compulsory
Example: "Facultative courses in the sciences"
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