Sentence:  Though there <WSD>is</WSD> obviously great need for continued experimentation with various types of short-term intervention to further efforts in developing an operational definition of prevention at the secondary - or perhaps , in some instances , primary - level , the place of short-term intervention has already been documented by a number of investigators in a wide variety of settings . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)