turbojet /tb.υdet/ noun a jet engine which includes a turbine-driven compressor for the air taken into the engine . The de Havilland Comet was the world’s first turbojet commercial transport aircraft.
COMMENT: In recent years turbofan engines have taken over from turbojet engines. Frank Whittle (1907–96) was an English engineer and RAF officer who invented the turbojet aircraft engine. Whittle developed a jet aircraft by 1941 and the first military jet aircraft, the Gloster Meteor, became operational in 1944.

turboprop /tb.υpr.p/, turbopro-peller /tb.υpr.pel./ noun a turbo-jet engine in which the turbine also drives a propeller . The turboprop

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engine is often used in transport air-craft.
COMMENT: Turboprop aircraft are efficient at lower speeds than turbojet aircraft and are often used for short-haul operations.
turboshaft /tb.υ.ɑft/ noun an
engine similar to a turboprop engine, except that it is used primarily in heli-copters
turbulence /tbjυl.ns/ noun an
irregular motion of the atmosphere
turbulent /tbjυl.nt/ adjective
referring to the irregular motion of the atmosphere . When flying in turbulent air conditions, an aircraft is subjected to upward and downward gust loads.
turn /tn/ noun 1. an angular change in track . a 180° turn . The autopilot may be engaged during a climb or descent but not usually in a turn. 2. a section of a wire which is wound 360° around a centre . The voltage in each winding is directly proportional to the number of turns in each winding. . verb
1. to make an angular change in track . turn right . Turn to the west. 2. to rotate