Definition of Portsmouth in US English:


proper noun

  • 1A port and naval base on the southern coast of England; population 201,800 (est. 2009). The naval dockyard was established here in 1496.

  • 2A historic port city in southeastern New Hampshire, on the Piscataqua River, off the Atlantic Ocean; population 20,443 (est. 2008).

  • 3A commercial and naval city in southeastern Virginia, on Hampton Roads, west of Norfolk; population 100,577 (est. 2008).