Part of speech:
Having the power or authority to elect; electoral.
Determined by independent arbiter.
Done intentionally, not by accident
Done or undertaken of one's own free will:
Empty or unoccupied:
Acting from necessity or compulsion; involuntary.
Employing or exerting compulsion; coercive.
Existing outside traditional or established institutions or systems:
(Philos.) Not subject to determinism; free
Capable of existing under varying environmental conditions or by assuming various behaviors. Bacteria that are facultative aerobes can live in both aerobic and anaerobic environments. A facultative parasite can live independently of its usual host.
Of, relating to, or giving advantage or preference:
The definition of obligatory is necessary, required or expected as a result of law or social custom.
Due to necessity or emergency
Find another word for optional. In this page you can discover 30 synonyms, antonyms, idiomatic expressions, and related words for optional, like: elective, noncompulsory, unrestricted, arbitrary, unforced, volitional, voluntary, nonobligatory, free, not required and according to one's will.