Definitions

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

  • noun The principle that a decision by a competent court in a case fully and fairly litigated is final and conclusive as to the claims and issues of the parties and cannot be relitigated.
  • noun A claim or issue that has been decided under this principle.

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

  • noun law An issue that is before a court, has already been decided by another court, and that therefore must be dismissed by the current court.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a matter already settled in court; cannot be raised again

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin rēs iūdicāta, thing decided : rēs, thing + iūdicāta, feminine past participle of iūdicāre, to judge.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin rēs ("thing, matter, affair") iūdicata, past participle of iūdico ("judge")

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