AskDefine | Define facultative

Dictionary Definition

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"

User Contributed Dictionary



  1. Of or relating to faculty, especially to mental faculty
  2. Not compulsory; optional, discretionary or elective
  3. That grants permission or power to do something
  4. (of an organism) Able to live under widely different environmental conditions (especially either aerobically or anaerobically)



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