The Collaborative International Dictionary of English v.0.48:

Moot \Moot\, v. t. [imp. & p. p. Mooted; p. pr. & vb. n.
   Mooting.] [OE. moten, motien, AS. m[=o]tan to meet or
   assemble for conversation, to discuss, dispute, fr. m[=o]t,
   gem[=o]t, a meeting, an assembly; akin to Icel. m[=o]t, MHG.
   muoz. Cf. Meet to come together.]
   1. To argue for and against; to debate; to discuss; to
      propose for discussion.
      [1913 Webster]

            A problem which hardly has been mentioned, much less
            mooted, in this country.              --Sir W.
                                                  Hamilton.
      [1913 Webster]

   2. Specifically: To discuss by way of exercise; to argue for
      practice; to propound and discuss in a mock court.
      [1913 Webster]

            First a case is appointed to be mooted by certain
            young men, containing some doubtful controversy.
                                                  --Sir T.
                                                  Elyot.
      [1913 Webster]

   3. To render inconsequential, as having no effect on the
      practical outcome; to render academic; as, the ruling that
      the law was invalid mooted the question of whether he
      actually violated it.
      [PJC]