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1. Something that has separate and distinct existence and objective or conceptual reality (Source: Merriam-Webster's Collegiate Dictionary)
2. Any sort of an entity of interest, usually something existing, happening, or purely abstract. [ Proton proton:Entity ]
3. The universal class of individuals. [ SUMO Ontology sumo:Entity ]
4. That which is perceived or known or inferred to have its own distinct existence (living or nonliving) [ WordNet 3.1 wordnet:Entity ]
5. Anything that exists (in any mode of existence). [ FL/GFO ]
6. An entity is a "thing" which can be distinctly identified. [ Chen, 1976 ] (conceptual modeling, ER modeling)
7. Anything that exists, including objects, processes, and qualities. [ [TermlistReferences#arpetal2015 Arp et al., 2015] ]