Elucidation: A material entity that is (1) spatially extended in three dimensions; (2) causally unified; and (3) maximally self-connected. Examples include a single cell, a laptop, an organism, a planet, a spaceship. Source: Robert Arp, Barry Smith, and Andrew D. Spear: Building Ontologies with Basic Formal Ontology. The MIT Press Cambridge, Massachusetts London, England. ©2015 Massachusetts Institute of Technology. ISBN 978-0-262-52781-1, Glossary. https://www.ebi.ac.uk/ols4/ontologies/bfo/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000030