Sentence:  ( 1 ) the various ways in which they interpret a particular social issue ; ( 2 ) their pattern of involvement in the regular legal and political processes ; and , most pervasively , ( 3 ) their interpretation of who <WSD>is</WSD> a `` real pro '' , of what it means to be a professional man in a technical , fragmented society . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)