Sentence:  It is interesting that , although the percentage of married students <WSD>is</WSD> not appreciably higher at Brooklyn than elsewhere - about 30 per cent of the women and 25 per cent of the men in the graduating class - the anxiety of the unmarried has puffed up the estimate . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)