The Collaborative International Dictionary of English v.0.48:

Mot \Mot\ (m[=o]t), v. [Sing. pres. ind. Mot, Mote, Moot
   (m[=o]t), pl. Mot, Mote, Moote, pres. subj. Mote;
   imp. Moste.] [See Must, v.] [Obs.]
   May; must; might.
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         He moot as well say one word as another  --Chaucer.
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         The wordes mote be cousin to the deed.   --Chaucer.
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         Men moot [i.e., one only] give silver to the poore
         freres.                                  --Chaucer.
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   So mote it be, so be it; amen; -- a phrase in some rituals,
      as that of the Freemasons.
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The Collaborative International Dictionary of English v.0.48:

Moot \Moot\, v. i.
   To argue or plead in a supposed case.
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         There is a difference between mooting and pleading;
         between fencing and fighting.            --B. Jonson.
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The Collaborative International Dictionary of English v.0.48:

Moot \Moot\, n. [AS. m[=o]t, gem[=o]t, a meeting; -- usually in
   comp.] [Written also mote.]
   1. A meeting for discussion and deliberation; esp., a meeting
      of the people of a village or district, in Anglo-Saxon
      times, for the discussion and settlement of matters of
      common interest; -- usually in composition; as, folk-moot.
      --J. R. Green.
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   2. [From Moot, v.] A discussion or debate; especially, a
      discussion of fictitious causes by way of practice.
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            The pleading used in courts and chancery called
            moots.                                --Sir T.
                                                  Elyot.
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   Moot case, a case or question to be mooted; a disputable
      case; an unsettled question. --Dryden.

   Moot court, a mock court, such as is held by students of
      law for practicing the conduct of law cases.

   Moot point, a point or question to be debated; a doubtful
      question.

   to make moot v. t. to render moot[2]; to moot[3].
      [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

moot \moot\ (m[=o]t), v.
   See 1st Mot. [Obs.] --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

moot \moot\ (m[=oo]t), n. (Shipbuilding)
   A ring for gauging wooden pins.
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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.
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            A problem which hardly has been mentioned, much less
            mooted, in this country.              --Sir W.
                                                  Hamilton.
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   2. Specifically: To discuss by way of exercise; to argue for
      practice; to propound and discuss in a mock court.
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            First a case is appointed to be mooted by certain
            young men, containing some doubtful controversy.
                                                  --Sir T.
                                                  Elyot.
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   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]

The Collaborative International Dictionary of English v.0.48:

Moot \Moot\, a.
   1. Subject, or open, to argument or discussion; undecided;
      debatable; mooted.
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   2. Of purely theoretical or academic interest; having no
      practical consequence; as, the team won in spite of the
      bad call, and whether the ruling was correct is a moot
      question.
      [PJC]

WordNet (r) 3.0 (2006):

moot
    adj 1: of no legal significance (as having been previously
           decided)
    2: open to argument or debate; "that is a moot question" [syn:
       arguable, debatable, disputable, moot]
    n 1: a hypothetical case that law students argue as an exercise;
         "he organized the weekly moot"
    v 1: think about carefully; weigh; "They considered the
         possibility of a strike"; "Turn the proposal over in your
         mind" [syn: consider, debate, moot, turn over,
         deliberate]