Sentence:  Both these types , and those in between , <WSD>are</WSD> in existence by reason of a legislative interest in libraries that began at Albany as early as 1950 , with the creation by the legislature of county library systems financed by county governments with matching funds from the state . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)