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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.
You know how important your heart is, so it's no wonder people worry when they hear someone has heart problems. Heart disease, also called cardiovascular (say: kar-dee-oh-VAS-kyoo-lur) disease, mainly affects older people and means that there are problems with the heart and blood vessels.