Webster's English Dictionary

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metaphysics

meta.phys.ics \.met-*-'fiz-iks\ n [ML Metaphysica, title of Aristotle's 
   treatise on the subject, fr. Gk ( pl but sing or pl in constr Xta) meta 
   (ta) physika, lit., the (works) after the physical (works); fr. its 
   position in his collected works 1a1: a division of philosophy that includes 
   ontology and cosmology  1a2: philosophy made up of ontology and 
   epistemology  1a3: ONTOLOGY  1b: the more abstruse philosophical sciences  
   2: METAPHYSIC