- facultative - of or relating to the mental faculties
- facultative - able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"
Antonym: obligate
- facultative - granting a privilege or permission or power to do or not do something; "a facultative enactment"
Antonyms: disabling, disqualifying (indirect, via enabling)
- facultative - not compulsory; "facultative courses in the sciences"
Antonym: obligatory (indirect, via optional)
- facultative - able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"