depreciate /d.pri.ie.t/ verb to
decrease in value . The aircraft depre-ciated by 100% over the 5 year period.
Opposite appreciate depreciation /d.pri.ie..(.)n/
noun a decrease in value . There was a depreciation of 100% in the value of the aircraft over the 5 year period. Oppo-site appreciation
depress /d.pres/ verb to push down
. Switches on the control columns instantly disengage the autopilot when depressed.
depression /d.pre.(.)n/ noun 1. an area of low atmospheric pressure . In the northern hemisphere, the wind blows anticlockwise round a depression and clockwise round an anticyclone and vice versa in the southern hemisphere. .
deep depression area of very low rela-tive atmospheric pressure 2. a lower area on a surface, which is often diffi-cult to see . A depression on the wing surface must be investigated in case it is an indication of more serious structural damage.
depressurisation /dipre..ra.
ze..(.)n/, depressurization noun a
loss, especially sudden, of cabin pres-sure . Emergency oxygen must be avail-able in the event of depressurisation.
depressurise /dipre..ra.z/, depressurize verb to lose pressure suddenly, or to cause to lose pressure .
The aircraft began to depressurise at 20,000 feet.
depth /depθ/ noun the distance from the top surface of something to the bot-tom . The troposphere’s depth is varia-ble in temperate latitudes.
derive /d.ra.v/ verb to get or to obtain
. Performance data is derived from flight tests. . Kepler derived the laws which relate to the motion of planets in their orbits.
69 detachable wheel spats
descend /d.send/ verb to lose alti-tude, usually in a planned manoeuvre .
the aircraft descended to 10,000 feet
the pilot reduced altitude until the air-craft was at 10,000 feet. Opposite
climb, ascend
descent /d.sent/ noun a planned loss of altitude . The descent from cruise altitude took 40 minutes. . in the descent during planned loss of altitude, usually in preparation for landing
‘…a search of radar recordings showed that a DC-10 had tracked within a few hundred metres of the house while passing 9,500 feet in the descent to Gatwick’ [Pilot]
describe /d.skra.b/ verb 1. to give the particular features of something . to describe what happened put into words exactly what happened 2. to draw a geometric figure or to move in a line that forms a geometric figure . The def-inition of a year is the time taken for a planet to describe one orbit around the sun. . to describe an arc to draw or move in an arc
description /d.skr.p..n/ noun 1.
the act of giving the particular features of something . a detailed description of world climate 2. the drawing or making of a geometric figure . the description of a triangle the drawing of a triangle
desert /dez.t/ noun a large area of dry often sandy country . Over desert areas the lack of water vapour produces cold nights.
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