a directed bipartite graph composed of concepts and relations

a labeled-bipartite directed graph

a list of zero or more concepts, conceptual relations, actors, special contexts, or comments

an orienled graph made up of concept nodes related by conceptual relation edges

A conceptual graph (CG) is a notation for logic based on the existential graphs of Charles Sanders Peirce and the semantic networks of artificial intelligence. In the first published paper on CGs, John F. Sowa used them to represent the conceptual schemas used in database systems.