Jasmine2001
altitude noun[C, usually sing.] the height above sea level: We are flying at an altitude of 6 000 metres. ◆ The plane made a dive to a lower altitude.[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.
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