Definitions from Wiktionary ( )

▸ noun:  (philosophy, uncountable) The branch of philosophy which studies fundamental principles intended to describe or explain all that is, and which are not themselves explained by anything more fundamental; the study of first principles; the study of being insofar as it is being (Latin: ens in quantum ens).
▸ noun:  (philosophy, countable) The view or theory of a particular philosopher or school of thinkers concerning the first principles which describe or explain all that is.
▸ noun:  (logic, uncountable, by extension from the philosophical sense) The metalogic of physics; the logical framework of physics.
▸ noun:  (uncountable, by extension from the philosophical sense) Any fundamental principles or rules.
▸ noun:  (uncountable) The study of a supersensual realm or of phenomena which transcend the physical world.
▸ noun:  (uncountable, derogatory) Displeasingly abstruse, complex material on any subject.

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