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altitude (n.)

late 14c., "elevation above the horizon" (of stars, planets), from Latin altitudinem (nominative altitudo) "height, altitude," from altus "high," literally "grown tall," from PIE root *al- (2) "to grow, nourish." General sense "space upward, height, vertical extent" is from early 15c. Related: Altitudinal; altitudinous.