"[A] word's full concept is defined in the model memory to be all the nodes that can be reached by an exhaustive tracing process, originating at its initial, patriarchical type node, together with the total sum of relationships among these nodes specified by within-plane, token-to-token links." - Quillian, M. Ross (1967), "Word Concepts: A Theory and Simulation of Some Basic Semantic Capabililties", Behavioral Science 12: 410-430; reprinted in R.J. Brachman & H.J. Levesque (eds.), Readings in Knowledge Representation (Los Altos, CA: Morgan Kaufmann, 1985): 97-118. - quote on p. 413 (reprint p. 101).