adjective. Of or relating to a mental faculty.

adjective. undefined

adjective. Capable of occurring or not occurring; contingent.

adjective. Not required or compulsory; optional.

adjective. Granting permission or authority.

adjective. Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.

Conferring a faculty, right, or power; enabling.

Hence Conferring the power of doing or not doing; rendering optional or contingent.

Having a faculty or power, but exercising it only occasionally or incidentally, or failing to exercise it; occasional or incidental; optional or contingent. Compare obligate.

adjective. Having relation to the grant or exercise faculty, or authority, privilege, license, or the like hence, optional; -- opposed to obligatory and compulsory, and sometimes used with to.

adjective. Of such a character as to admit of existing under various forms or conditions, or of happening or not happening, or the like

adjective. Pertaining to a faculty or faculties.

adjective. Of or relating to faculty, especially to mental faculty

adjective. Not obligate; optional, discretionary or elective

adjective. That grants permission or power to do something

adjective. Able to grow in or outside of a host or host cell

adjective. able to exist under more than one set of conditions

adjective. not compulsory

adjective. granting a privilege or permission or power to do or not do something

adjective. of or relating to the mental faculties

"The Turkish children featured in the documentary show what I'd call facultative quadrupedalism; they walk on all fours out of necessity."

compulsory  obligate  obligatory  

facultative hypermetropia  facultative parasite  facultative saprophyte  

enabling  optional  

facultatively  

antenatal  criminalized  fish  food-poisoning  multidrug-resistant  

optional