altitude

Universal Words noun 1 [C,usually sing.] the height above sea level: We are flying at an altitude of 6000 metres. * The plane made a dive to a lower altitude. 2 [C,usually pl.,U] a place that is high above sea level: Snow leopards live at high altitudes. * The athletes trained at altitude in Mexico City. * The climbers failed to reach the summit because of altitude sickness.