1 A difference in views, especially in public, between individuals taking opposite sides on a particular issue. 2 In constitutional law, an actual, definite, and concrete dispute over legal rights between parties with adverse interests wherein one party is seeking an adjudication of the dispute and specific relief of a conclusive nature. Also called case or controversy requirement. See also adversary proceeding. separable controversy. A cause of action or claim that is part of a lawsuit, but ...