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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.
5[singular] heart (of something) the most important part of something the heart of the matter/problem The committee's report went to the heart of the government's dilemma. The distinction between right and wrong lies at the heart of all questions of morality.