n.
   - a structure leading out to sea and used as a landing stage for boats or as a place of entertainment. 
▸a breakwater or mole.
 - Brit. a long, narrow structure projecting from an airport terminal and giving access to an aircraft.
 - the pillar of an arch or one supporting a bridge. 
▸a wall between windows or other adjacent openings.
 
 
  Etymology
  ME: from med. L. pera, of unknown origin.