definition
(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).
definition
(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.
definition
(logic, uncountable, by extension from the philosophical sense) The metalogic of physics; the logical framework of physics.
definition
(uncountable, by extension from the philosophical sense) Any fundamental principles or rules.
definition
(uncountable) The study of a supersensual realm or of phenomena which transcend the physical world.
definition
(uncountable, derogatory) Displeasingly abstruse, complex material on any subject.