1. A platform extending from a shore over water and supported by piles or pillars, used to secure, protect, and provide access to ships or boats. 2. Such a structure used predominantly for entertainment. 3. A supporting structure at the junction of connecting spans of a bridge. 4. Any of various vertical supporting structures, especially: 5. A pillar, rectangular in cross section, supporting an arch or roof. 6. The portion of a wall between windows. 7. A reinforcing structure that projects from a wall; a buttress.
