WordNet (r) 3.0 (2006):

Columbus
    n 1: the state capital of Ohio; located in the center of the
         state; site of Ohio State University [syn: Columbus,
         capital of Ohio]
    2: Italian navigator who discovered the New World in the service
       of Spain while looking for a route to China (1451-1506) [syn:
       Columbus, Christopher Columbus, Cristoforo Colombo,
       Cristobal Colon]
    3: a town in eastern Mississippi near the border with Alabama
    4: a city in western Georgia on the Chattahoochee River;
       industrial center