- (architecture) A little tower, frequently a merely ornamental structure at one of the corners of a building or castle.
- (historical, military) A siege tower; a movable building, of a square form, consisting of ten or even twenty stories and sometimes one hundred and twenty cubits high, usually moved on wheels, and employed in approaching a fortified place, for carrying soldiers, engines, ladders, casting bridges, and other necessaries.
- (electronics) A tower-like solder post on a turret board (a circuit board with posts instead of holes).
- (military) An armoured, rotating gun installation on a fort, ship, aircraft, or armoured fighting vehicle.
- (rail transport) The elevated central portion of the roof of a passenger car, with sides that are pierced for light and ventilation.
- There breathes no being but has some pretence / To that fine instinct called poetic sense; […] / The freeman, casting with unpurchased hand / The vote that shakes the turrets of the land.
- A very tall iron-framed structure, usually painted red and white, on which microwave, radio, satellite, or other communication antennas are installed; mast.
- A similarly framed structure with a platform or enclosed area on top, used as a lookout for spotting fires, plane crashes, fugitives, etc.
- A water tower.
- A control tower.
- Any very tall building or structure; skyscraper.
- (figurative) Any item, such as a computer case, that is usually higher than it is wide.
- (informal) An interlocking tower.
- (figurative) A strong refuge; a defence.
- (historical) A tall fashionable headdress worn in the time of King William III and Queen Anne.
- (obsolete) High flight; elevation.
- The sixteenth trump or Major Arcana card in many Tarot decks, usually deemed an ill omen.
- (cartomancy) The nineteenth Lenormand card, representing structure, bureaucracy, stability and loneliness.
- The Sears Tower
- Thou hast been a shelter for me, and a strong tower from the enemy.
- Lay trains of amorous intrigues / In towers, and curls, and periwigs.