Sentence:  Freeman , Cameron and McGhie , in their description of the disturbances of thinking found in chronic schizophrenic patients , say , in regard to condensation , that `` the lack of adequate discrimination between the self and the environment , and the objects contained therein in itself <WSD>is</WSD> the prototypical condensation '' . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)