1. That which occupies space and has mass; physical substance.
2. A type of such substance: organic matter.
3. Discharge or waste, such as pus or feces, from a living organism.
4. Philosophy In Aristotelian and Scholastic use, that which is in itself undifferentiated and formless and which, as the subject of change and development, receives form and becomes substance.
5. The substance of thought or expression as opposed to the manner in which it is stated or conveyed.
6. A subject of concern, feeling, or action: matters of foreign policy; a personal matter. See Synonyms at subject.
7. Trouble or difficulty: What’s the matter with your car?
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