<p><strong>Noun</strong></p><ul><li>anything built or serving to bar passage, as a railing, fence, or the like</li><li>any natural bar or obstacle: a mountain barrier</li><li>anything that restrains or obstructs progress, access, etc.: a trade barrier</li><li>a limit or boundary of any kind: the barriers of caste</li><li>Physical Geography: an Antarctic ice shelf or ice front</li><li>barriers, History/Historical: the palisade or railing surrounding the ground where tourneys and jousts were carried on</li><li>Archaic: a fortress or stockade</li></ul>