Definition of Omaha from the Oxford Advanced Learner's Dictionary

 

Omaha

 
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the largest city in the US state of Nebraska. It is on the Missouri River on the border of Iowa. Lewis and Clark visited the area in 1804, and it was settled in 1854, being named after a local Native American people. It is a centre for insurance companies and companies that process food.
See the Oxford Advanced American Dictionary entry: Omaha