metaphysics, metaphysic 1. Philosophy The branch of philosophy that examines the nature of reality, including the relationship between mind and matter, substance and attribute, fact and value (used with a singular verb). 2. The theoretical or first principles of a particular discipline: the metaphysics of law (used with a plural verb).BR> 3. A pr... Found on http://www.wordinfo.info/words/index/info/view_unit/1300/6