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‘Kelly wants to develop the Astroliner, a winged rocket towed into the air by a 747 jet and released at altitude to soar on a suborbital trajectory under its own power.’
‘This century's leap into aviation and space travel has brought with it a much deeper understanding of the human ability to function at altitude.’
‘He spends long periods of time training at altitude in his home country.’
‘If cabin depressurization occurs at altitude and goes above this value, passengers in shirt sleeves will die shortly.’
‘The Superfort, its mission apparently completed, descended from altitude and the pilot decided to do a bit of joy riding.’
‘The material soaks up water that freezes at altitude and can cause delamination that may not be readily visible.’
‘Both nations have struggled in recent years while playing at altitude, where the thin air hands an advantage to those acclimatised to the conditions.’
1.2Astronomy The apparent height of a celestial object above the horizon, measured in angular distance.
‘If the object is below the horizon then the altitude is negative.’
‘Also, on any given day the Sun circles the sky at the same apparent altitude.’
‘A scale along the staff showed the altitude, or angle above the horizon, of the body.’
‘Like other nautical instruments its primary function was to measure the altitude of the sun or a star above the horizon.’
‘Spacecraft orbiting Earth can be found in several different types of orbits based on their altitude and orientation.’
1.3Geometry The length of the perpendicular line from a vertex to the opposite side of a figure.
‘This is a good deal like having a theory that tells us that the area of a plane figure is one-half the base times the altitude, without telling us for what figures this holds.’
‘Let y be the altitude of the triangular cross section of the wedge in Figure 6a cut by a plane at distance x from the base.’
Origin
Late Middle English: from Latin altitudo, from altus ‘high’.