<p><strong>Noun</strong></p><ul><li>A British crown colony comprising a fortress and seaport located on a narrow promontory near the southern tip of Spain.</li><li>Rock of Gibraltar.</li><li>Ancient Calpe.</li><li>A long, precipitous mountain nearly coextensive with this colony: one of the Pillars of Hercules.</li><li>1,396 feet (426 meters) high; 2.5 miles (4 kilometers) long.</li><li>Any person or thing that has strength and endurance that can be relied on.</li><li>Strait of Gibraltar, a strait between Europe and Africa at the Atlantic entrance to the Mediterranean Sea.</li><li>8.5–23 miles (14–37 kilometers) wide.</li><li>Any impregnable fortress or stronghold.</li></ul>