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Noun allegheny has 1 sense
  1. Allegheny, Allegheny River - a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River
    --1 is a kind of river
    --1 is a part of
     Pennsylvania, Keystone State, PA; New York, New York State, Empire State, NY
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