Understanding meaning is sometimes termed "the really hard problem." Kintsch (in Attention and Performance, R. S. Nickerson, ed., Lawrence Erlbaum, 1980) attributes to Aristotle a feature model of meaning. The meaning of "man" is the set of features that a man possesses: "two legs", "two arms", "a mind", etc. A concept stored in Asa H has such features associated with it (on the next lower level of the memory hierarchy).
Quillian's "semantic networks" were conceived as a representational format that would permit the meanings of words to be stored. Each concept is defined in terms of its associations (links and uses) with other concepts in the network. Again, a network like the one learned and used by Asa H.