- 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;
phylosophy in general; first principles, or the science of first
principles. - Hence: The scientific knowledge of mental phenomena;
mental philosophy; psychology.