Facultative /(?)/

Fac·ul·ta·tive

Facultative

a.
  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; (Biol.)
  3. Pertaining to a faculty or faculties. (Physiol.)
    In short, there is no facultative plurality in the mind; it is a single organ of true judgment for all purposes, cognitive or practical.