1154, from O.E. gemot
"meeting" (especially of freemen, to discuss community affairs or mete justice), from P.Gmc. *ga-motan
(cf. Old Low Frankish muot
"encounter," M.Du. moet,
), from collective prefix *ga-
(v.)). The adj. senses of "debatable" and "not worth considering" arose from moot case,
earlier simply moot (n.)
"discussion of a hypothetical law case" (1531), in law student jargon, in ref. to students gathering to test their skills in mock cases.