facultative


Concise Oxford English Dictionary © 2008 Oxford University Press:
facultative /ˈfak(ə)lˌtətɪv/
adjective
  • 1 occurring optionally in response to circumstances rather than by nature.
  • 2 Biology capable of but not restricted to a particular function or mode of life: a facultative parasite.
– derivatives
facultatively adverb.
– origin C19: from Fr. facultatif, -ive, from faculté (see faculty).
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