| altimeter | (noun) an instrument that measures the height above ground; used in navigation | - |
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| altissimo | (adjective) very high | - |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| altitudinal | (adjective) pertaining to altitude | - |
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| altitudinous | (adjective) indefinitely high; lofty | - |
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