Sentence:  The existence of conflict and of vigorous union demand for an increase in money wages does not contradict the assumption that the union <WSD>is</WSD> willing to settle for cost-of-living and productivity share increases as distinct from a cost raising increase in the basic wage rate . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)