The Collaborative International Dictionary of English v.0.48:

flagpole \flag"pole`\ (fl[a^]g"p[=o]l`), n.
   A pole used to display a flag.
   [PJC]

WordNet (r) 3.0 (2006):

flagpole
    n 1: surveying instrument consisting of a straight rod painted
         in bands of alternate red and white each one foot wide;
         used for sightings by surveyors [syn: range pole,
         ranging pole, flagpole]
    2: a tall staff or pole on which a flag is raised [syn:
       flagpole, flagstaff]