Sentence:  In a sample of new members of <WSD>Pittsburgh</WSD> churches , almost 60 per cent were recruited by initial `` contacts with friendly members '' . 
Meaning of the word marked with <WSD> tags:  a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie Mellon University and the University of Pittsburgh