The science of real as distinguished from phenomenal being; ontology; also, the science of being, with reference to its abstract and universal conditions, as distinguished from the science of determined or concrete being; the science of the conceptions and relations which are necessarily implied as true of every kind of being; philosophy in general; first principles, or the science of first principles.
- Philosophy The branch of philosophy that examines the nature of reality, including the relationship between mind and matter, substance and attribute, fact and value.
- The theoretical or first principles of a particular discipline: the metaphysics of law.
- A priori speculation upon questions that are unanswerable to scientific observation, analysis, or experiment.
- Excessively subtle or recondite reasoning.