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matter of the heart definition, matter of the heart meaning | English dictionary. matter. 2 substance that occupies space and has mass, as distinguished from substance that is mental, spiritual, etc. n the substance or main theme of a book, discussion, debate, etc.
1 : a hollow muscular organ of the body that expands and contracts to move blood through the arteries and veins. 2 : something shaped like a heart a Valentine's heart. 3 : a part near the center or deep into the interior They reached the heart of the desert. 4 : the most essential part That's the heart of the problem.