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reach through the tropopause.
react /ri|kt/ verb 1. to act in response
to an action
Because the rotors and
stators of a compressor are of aerofoil
shape, the airflow reacts in a similar
way to the airflow over a wing. 2. to do
or to say something in response to
words or to an event
The cabin crew
reacted swiftly when the fire broke out.
3.  to react with something to change
chemical composition because of
another substance
The electrolyte in
the cells of a lead-acid battery reacts
chemically with the plates.
reactance reactance /ri|ktəns/ noun a component
of impedance in an alternating
current circuit
Reactance is a form of
resistance which varies as the frequency
changes.
reaction reaction /ri|kʃən/ noun a response
to an action or stimulus
For every
action there is an equal and opposite
reaction.
Passenger reaction may be
slower than usual in an emergency situation.

Quick reactions are needed in
an emergency.
reaction thrust principle reaction thrust principle /ri|
kʃən θrst prnsp(ə)l/ the process
by which exhaust gases coming of the
back of an object cause a reaction force
to act on the object and push it forwards
readback readback /ridbk/ noun the action
of repeating an ATC message to the
controller to enable him or her to check
that it was correctly received
readily readily /redli/ adverb 1. promptly,
immediately
Fire extinguishers must
be readily available for use.
Ice melts
very readily at 0°C (Celsius). 2.  it can
readily be seen it can be easily understood

It can readily be seen from the
preceding paragraph that density and
pressure are linked.
reading reading /ridŋ/ noun 1. information
indicated by an instrument or gauge 
altimeter reading the altitude indicated
by the altimeter  barometer
reading the barometric pressure indicated
by the barometer 2.  map reading
the act of interpreting information
on a map
readout 188
readout readout /ridaυt/ noun a display or
presentation of data from calculations
or storage
The rotating beam cloud
base recorder/indicator operates continuously,
day and night and produces
an automatic readout of cloud base
height.
rear rear /rə/ noun the aft part, the part furthest
from the front
the rear of the aircraft
 adjective at the back, or referring
to the back
The rear part of the aircraft
is called the aft section.
rearward rearward /rəwəd/ adjective towards
the aft or the rear
The expanding gas
travels in a rearward direction.
reason reason /riz(ə)n/ noun the basis or
motive for an action
A rough surface
is more susceptible to fatigue cracking
than a smooth one and for this reason
highly stressed members are often polished.
reasonable reasonable /riz(ə)nəb(ə)l/ adjective
1. acceptable or fair  a reasonable
sum of money a sum of money which is
not too high or which is acceptable 2.
within the boundaries of common sense

It would be reasonable to expect that
radio frequencies would travel through
the air in straight lines as a direct wave,
but they bend, or refract.
receive receive /r|siv/ verb to get, to obtain

The sides of the hills and mountains
which face the sun receive more intense
radiation than flat surfaces because of
the angle of exposure to the sun.
receiver receiver /r|sivə/ noun a device that
receives incoming radio signals and
converts them to sound or light
The
transponder in the aircraft consists of a
transmitter and a receiver.
recent recent /ris(ə)nt/ adjective referring
to a time immediately before the
present
Recent engine designs include
variable angle stator blades.
A more
recent development is the barograph
which utilises the electrical output of
the digital display barometer.  recent
weather significant weather observed
in the period since the previous observation,
but not now
reception reception /r|sepʃən/ noun an act or
instance of receiving radio signals

The antenna is highly directive in transmission
and reception.
reciprocal reciprocal /r|sprək(ə)l/ adjective 
reciprocal heading an opposite heading,
180° from a given heading
The
reciprocal heading of 090° is 270°. 
noun the exactly opposite direction
A
wave transmitted vertically returns to
　
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