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say it: FAK-uhl-tay-tiv
facultative is an adjective meaning "of or relating to the mental faculties". It carries 4 recorded senses.
of or relating to the mental faculties
able to exist under more than one set of conditions
“a facultative parasite can exist as a parasite or a saprophyte”
biology
granting a privilege or permission or power to do or not do something
“a facultative enactment”
not compulsory
“elective surgery”
“an elective course of study”
Definitions, synonyms and semantic relations for facultative come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.