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altitude the height of a thing above earth or above sea level.
Dead Sea a large salt lake between the countries of Israel and Jordan. The Dead Sea lies at about 1300 feet below sea level, which makes it the lowest known place on the surface of the earth.
elevation the height to which something rises or is raised, or its height above sea level or ground level. [1/2 definitions]
sonic of, related to, or being a speed approaching or equal to that of sound in air, at the same distance above sea level. [1/2 definitions]