ability /.'b.l.ti/ noun the power, knowledge or skill needed to do some-thing 0 Strength is the ability of a mate-rial to support a load.口 he has great ability he has good skills or is very clever
able /'e.b(.)l/ adjective skilful and competent口 to be able to to have the power, knowledge, skill or strength to do something 0 Is she able to carry this heavy suitcase?
able-bodied /，e.b (.)l 'b.did/ adjec-tive referring to a person who has no physical disabilities 0 Physically disad-vantaged as well as able-bodied people can gain a PPL.
abnormal /.b'n.:m(.)l/ adjective
not normal
abnormality /， .bn.:'m.l.ti / noun
something that is not normal, expected or correct, and is therefore possibly worrying 0 Any abnormality in engine performance should be checked.
abnormal load /.b，n.:m (.)l 'l.υd/
noun a load which is heavier than nor-
mal abort /.'b.:t/ verb 1. to stop some-thing taking place 0 They had to abort the landing because of a violent storm
2. to end something before it has fin-ished
absolute /'.bs.lu:t/ adjective com-
plete, total 口 absolute necessity some-thing that you cannot manage without under any circumstances 口 absolute silence a condition in which no sound of any kind can be heard
absolute ceiling /，.bs.lu:t 'si:l.. /
noun the maximum height above sea level at which an aircraft can maintain horizontal flight
absolute humidity /，.bs.lu:t hju: 'm.d.ti/ noun the vapour concentration or mass of water in a given quantity of air
absolute pressure 2
absolute pressure /， .bs.lu:t 'pre../ noun a unit of force per unit of area without comparison to other pres-sure 0 Aircraft show absolute pressure in inches of mercury on the inlet mani-fold pressure gauge.
absolute value /，.bs.lu:t 'v.lju: /
the size or value of a number regardless of its sign 0 The absolute value of –64.32 is 64.32.
absolute zero /，.bs.lu:t 'z..r.υ /
noun the lowest temperature possible, 0 °K, or –273.15 °C
absorb /.b'z.:b/ verb to take in 0
Warm air absorbs moisture more easily than cold air. 0 Our bodies absorb oxy-gen.口 to absorb information to under-stand and remember something 0 Only a few passengers absorb the pre-depar-ture safety information.
absorption /.b'z.:p..n/ noun the
act of taking something in 0 There is absorption of energy by the tyre when the aircraft lands.
AC abbreviation 1. alternating current
2. altocumulus (ICAO) ACARS abbreviation airborne com-
munication, addressing and reporting system ACAS /'e.k.s/ abbreviation airborne
collision avoidance system ACC abbreviation area control centre accelerate /.k'sel.re.t/ verb to
increase speed 0 After start-up, the engine accelerates up to idling speed. 0 The aircraft accelerated down the run-way and took off. Opposite decelerate
acceleration /.k，sel.'re.. (.)n/ noun 1. the act of increasing the speed of something or of going faster. Oppo-site deceleration (NOTE: Acceleration can be felt as an aircraft begins its take-off run.) 2. a force that pulls outwards and is caused by a change in direction rather than a change in speed 0 Acceler-ation forces can be felt during aerobatic manoeuvres.
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