moot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Subject to debate; arguable or unsettled.
• adjective Of no practical importance; irrelevant.
• adjective Not presenting an open legal question, as a result of the occurrence of some event definitively resolving the issue, or the absence of a genuine case or controversy.
• adjective Of no legal significance; hypothetical.
• transitive verb To bring up (a subject) for discussion or debate. synonym: broach.
• transitive verb To discuss or debate.
• transitive verb To render (a subject or issue) irrelevant.
• transitive verb To argue (a case) in a moot court.
• transitive verb To render (a legal issue or question) irrelevant.
• noun The discussion or argument of a hypothetical case by law students as an exercise.
• noun A hypothetical case used for such a discussion or argument.
• noun An ancient English meeting, especially a representative meeting of the freemen of a shire.

from The Century Dictionary.

• Relating to or connected with debatable questions; subject to discussion; discussed or debated; debatable; unsettled.
• noun An obsolete variant of mot.
• To debate; discuss; argue for and against; introduce or submit for discussion.
• Specifically
• In law, to plead or argue (a cause or supposed cause) merely by way of exercise or practice.
• To speak; utter.
• To argue; dispute.
• To plead or argue a supposed cause.
• To dig.
• noun In ship-building:
• noun A ring used to gage the diameter of treenails.
• noun A piece of hard wood bound with iron at both ends, used in making blocks.
• noun A meeting; a formal assembly.
• noun The place of such a meeting.
• noun In early English history, a court formed by assembling the men of the village or tun, the hundred, or the kingdom, or their representatives.
• noun Dispute; debate; discussion; specifically, in law, an argument on a hypothetical case by way of practice.

from the GNU version of the Collaborative International Dictionary of English.

• verb obsolete See 1st mot.
• transitive verb To argue for and against; to debate; to discuss; to propose for discussion.
• transitive verb Specifically: To discuss by way of exercise; to argue for practice; to propound and discuss in a mock court.
• transitive verb To render inconsequential, as having no effect on the practical outcome; to render academic.
• noun 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.
• noun A discussion or debate; especially, a discussion of fictitious causes by way of practice.
• noun a case or question to be mooted; a disputable case; an unsettled question.
• noun a mock court, such as is held by students of law for practicing the conduct of law cases.
• noun a point or question to be debated; a doubtful question.
• noun to render moot{2}; to moot{3}.
• noun (Shipbuilding) A ring for gauging wooden pins.
• intransitive verb To argue or plead in a supposed case.
• adjective Subject, or open, to argument or discussion; undecided; debatable; mooted.
• adjective Of purely theoretical or academic interest; having no practical consequence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective UK Subject to discussion (originally at a moot); arguable, debatable, unsolved or impossible to solve.
• adjective North America Having no practical impact or relevance.
• adjective North America Being an exercise of thought; academic.