Facultative vs. Obligate

Facultativeadjective

Of or relating to faculty, especially to mental faculty

Facultativeadjective

Not obligate; optional, discretionary or elective

Facultativeadjective

That grants permission or power to do something

Facultativeadjective

(biology) Able to perform a particular life function, or to live generally, in more than one way

Facultativeadjective

At which a given function is positive.

Facultativeadjective

Having relation to the grant or exercise faculty, or authority, privilege, license, or the like hence, optional; as, facultative enactments, or those which convey a faculty, or permission; the facultative referendum of Switzerland is one that is optional with the people and is necessary only when demanded by petition; facultative studies; - opposed to obligatory and compulsory, and sometimes used with to.

Facultativeadjective

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

Facultativeadjective

Pertaining to a faculty or faculties.

Facultativeadjective

of or relating to the mental faculties

Facultativeadjective

able to exist under more than one set of conditions;

Facultativeadjective

granting a privilege or permission or power to do or not do something;

Facultativeadjective

not compulsory;

Facultativeadjective

occurring optionally in response to circumstances rather than by nature

Facultativeadjective

capable of but not restricted to a particular function or mode of life

Facultative

Facultative means or (antonym obligate), used mainly in biology in phrases such as: Facultative (FAC), facultative wetland (FACW), or facultative upland (FACU): wetland indicator statuses for plants Facultative anaerobe, an organism that can use oxygen but also has anaerobic methods of energy production. It can survive in either environment Facultative biotroph, an organism, often a fungus, that can live as a saprotroph but also form mutualisms with other organisms at different times of its life cycle.

Obligateverb

To bind, compel, constrain, or oblige by a social, legal, or moral tie.

Obligateverb

To cause to be grateful or indebted; to oblige.

Obligateverb

To commit (money, for example) in order to fulfill an obligation.

Obligateadjective

(biology) Able to exist or survive only in a particular environment or by assuming a particular role.

Obligateadjective

Absolutely indispensable; essential.

Obligateverb

To bring or place under obligation, moral or legal; to hold by a constraining motive.

Obligateverb

To bind or firmly hold to an act; to compel; to constrain; to bind to any act of duty or courtesy by a formal pledge.

Obligateverb

force or compel somebody to do something;

Obligateverb

commit in order to fulfill an obligation;

Obligateverb

bind by an obligation; cause to be indebted;

Obligateadjective

restricted to a particular condition of life;

Obligate

As an adjective, obligate means (antonym facultative) and is used mainly in biology in phrases such as: Obligate aerobe, an organism that cannot survive without oxygen Obligate anaerobe, an organism that cannot survive in the presence of oxygen Obligate air-breather, a term used in fish physiology to describe those that respire entirely from the atmosphere Obligate biped, Bipedalism designed to walk on two legs Obligate carnivore, an organism dependent for survival on a diet of animal flesh. Obligate hibernation, a state of inactivity in which some organisms survive conditions of insufficiently available resources.