geographical name
\ ō-ˈhī-(ˌ)ō How to pronounce Ohio (audio) , ə-, \

Definition of Ohio

1 river 981 miles (1578 kilometers) long in the eastern part of the U.S. flowing west from the junction of the Allegheny and Monongahela rivers in western Pennsylvania, forming the boundaries between Ohio and West Virginia, Ohio and Kentucky, Indiana and Kentucky, and Illinois and Kentucky, and then flowing into the Mississippi River at the southern tip of Illinois
2 state in northeast central U.S. bordering on Lake Erie; capital Columbus area 41,222 square miles (106,765 square kilometers), population 11,536,504

Other Words from Ohio

Ohioan \ ō-​ˈhī-​ō-​ən How to pronounce Ohioan (audio) , ə-​ \ noun

Learn More about Ohio

Statistics for Ohio

Cite this Entry

“Ohio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Ohio. Accessed 17 Feb. 2020.

More from Merriam-Webster on Ohio

Nglish: Translation of Ohio for Spanish Speakers

Britannica English: Translation of Ohio for Arabic Speakers

Comments on Ohio

What made you want to look up Ohio? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!