What is Matter In Dispute?

Legal Definition
The subject of litigation ; the matter for which a suit is brought and upon which issue is joined, and in relation to which jurors are called and witnesses examined. Lee v. Watson, 1 Wall. 339, 17 L. Ed. 557; Smith v. Adams, 130 U. S. 167, 9 Sup. Ct. 566, 32 L. Ed. 985.
-- Black's Law Dictionary