Definition of: interposition

(in′tər·pə·zish′ən) noun
1. The act of interposing.
2. That which is interposed.
3. In U.S. political theory, the doctrine and practice of interposing the sovereign powers of a State between the people of that State and the enforcement of a Federal statute or judicial ruling that is deemed by the State government to infringe upon its sovereignty and the autonomy of its institutions. [<OF]