Allegheny

American  

[al-i-gey-nee] / ˌæl ɪˈgeɪ ni /

noun

1. 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 miles (525 km) long.

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Other Word Forms

• Alleghanian adjective
• Alleghenian adjective
• trans-Alleghenian adjective

Example Sentences

Kendra Sullivan was at her family’s cabin in the Allegheny Highlands region in late October “just planning on having a low-key country weekend.”

From Salon • Mar. 28, 2026

Allegheny County Executive Sara Innamorato called the closure a loss “when it comes to transparency in government, accountability from our institutions, and learning about what is happening in our communities.”

From The Wall Street Journal • Jan. 7, 2026

“We built it for USAir,” Allegheny County executive Rich Fitzgerald said many years later, “hoping that they would grow jobs here, putting their hub and their headquarters here.”

From Slate • Nov. 24, 2025

Where I’m from, everybody who is Black in our city has a reference point to the Allegheny County Jail, which is in the middle of Pittsburgh.

From Los Angeles Times • Apr. 17, 2025

Still, coal miners in the Allegheny and Kiskiminetas river valleys, a region rich with natural resources, seemed stuck in poverty.

From "Fannie Never Flinched" by Mary Cronk Farrell