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: a claim against a party on the same side of an action (as a coplaintiff or codefendant) compare counterclaim, cross-action, cross-appeal, third-party claim NOTE: Under Rule 13(g) of the Federal Rules of Civil Procedure, a cross-claim must be related to the original action in that it arises from the same transaction or occurrence as the original action or a counterclaim, or involves property that is the subject matter of the original action.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.