While thesaurus-style theorists have sometimes taken the extreme view that relations are all that is needed fOr Meaning, no successful model of the lexicon. has been able to rely on relations only and completely leave out any ldnd of definitional meaning.Figure 6.5 shows us thatwalkiitg and jumping are different kinds of moving, but it does not tell us how to walk or jump Similarly, if you looked at a box diagram of locomotion terms fora language you didn't know, yon Would be able to Say 'which were the more general terms. and which contrasted, but you probably would not be able to translate the words into English. This lack of definitional information has proved difficult for computational models. that use thesaurus-style links among Words. Most such models (like WordNet and MTT) include definitions as well as relations.