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facultative


Definition of facultative

adjective

  • occurring optionally in response to circumstances rather than by nature: facultative adjustment in relation to competitive abilities
  • Biology capable of but not restricted to a particular function or mode of life:a facultative parasiteOften contrasted with obligate.

Derivatives

facultatively

adverb

Origin:

early 19th century: from French facultatif, -ive, from faculté (see faculty)

facultative in other Oxford dictionaries

Definition of facultative in the US English dictionary
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