facultative

adjectives

of or relating to the mental faculties
facultative
pertains to
faculty
able to exist under more than one set of conditions
"a facultative parasite can exist as a parasite or a saprophyte"
facultative
antonym
obligate
domain category
the science that studies living organisms
biological science, biology
granting a privilege or permission or power to do or not do something
"a facultative enactment"
facultative
is similar to
providing legal power or sanction
"an enabling resolution"; "enabling power"
enabling
not compulsory
"facultative courses in the sciences"
facultative
is similar to
possible but not necessary; left to personal choice
optional