An industrial city and naval port on the Pacific coast of southern California, just north of the border with Mexico; population 1,279,329 (est. 2008).
Definition of San Diego in US English:
San Diego
proper nounˌsan dēˈāɡō
An industrial city and naval port on the Pacific coast of southern California, just north of the US-Mexico border; population 1,279,329 (est. 2008). It was founded as a mission in 1769.