- a British crown colony comprising a fortress and seaport located on a narrow promontory near the southern tip of Spain. 1.875 sq. mi. (5 sq. km).
- Rock of Gibraltar.
- a long, precipitous mountain nearly coextensive with this colony: one of the Pillars of Hercules. 1,396 feet (426 meters) high; 2.5 miles (4 kilometers) long.
- any person or thing that has strength and endurance that can be relied on.
- a strait between Europe and Africa at the Atlantic entrance to the Mediterranean Sea. 8.5–23 miles (14–37 kilometers) wide.
- any impregnable fortress or stronghold.
- a city on the Rock of Gibraltar, a limestone promontory at the tip of S Spain: settled by Moors in 711 and taken by Spain in 1462; ceded to Britain in 1713; a British crown colony (1830–1969), still politically associated with Britain; a naval and air base of strategic importance. Pop: 29 111 (2013 est). Area: 6.5 sq km (2.5 sq miles)
- a narrow strait between the S tip of Spain and the NW tip of Africa, linking the Mediterranean with the Atlantic
