Omaha UK /ˈəʊməhɑː/US /ˈoʊməhɑ/ noun2 •The largest city in Nebraska, United States, and the county seat of Douglas County.Voters in Omaha were set to make history Tuesday by either reelecting the city’s first female mayor to a rare fourth term or electing the community’s first Black mayor. — 2025 •A member of a tribe of Native Americans currently residing in northeastern Nebraska and western Iowa. formsOmahas