Dictionary![]() ![]() Al•le•ghe•nyPronunciation: (al"i-gā'nē), [key] —n. a river flowing NW from Pennsylvania into SW New York and then S through W Pennsylvania, joining the Monongahela at Pittsburgh to form the Ohio River. 325 mi. (525 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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