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facultative

Source : Webster's Revised Unabridged Dictionary (1913)

Facultative \Fac"ul*ta*tive\, a. [L. facultas, -atis, faculty:
   cf. F. facultatif, G. fakultativ.]
   1. 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.

   2. Of such a character as to admit of existing under various
      forms or conditions, or of happening or not happening, or
      the like; specif.: (Biol.) Having the power to live under
      different conditions; as, a facultative parasite, a plant
      which is normally saprophytic, but which may exist wholly
      or in part as a parasite; -- opposed to {obligate}.

   3. (Physiol.) Pertaining to a faculty or faculties.

            In short, there is no facultative plurality in the
            mind; it is a single organ of true judgment for all
            purposes, cognitive or practical.     --J.
                                                  Martineau.

Source : WordNet®

facultative
     adj 1: of or relating to the mental faculties
     2: able to exist under more than one set of conditions; "a
        facultative parasite can exist as a parasite or a
        saprophyte" [ant: {obligate}]
     3: granting a privilege or permission or power to do or not do
        something; "a facultative enactment"
     4: not compulsory; "facultative courses in the sciences"
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