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increase with height, the speed of the
wind at the crest of a wave being the
greatest.
waveform waveform /wevfɔm/ noun the
shape of a repetitive wave
A cycle is
one complete sequence of the waveform,
from any point, to the same value
360° later.
wavelength wavelength /wevleŋθ/ noun the
distance from the highest point of one
wave to the highest point of the next

Short wavelength permits sharper
beams for direction finding and more
efficient reflections.
waveoff waveoff /wevɒf/ noun a signal or
instruction to an aircraft that it should
not land
waypoint 250
waypoint waypoint /wepɔnt/ noun a predetermined
position on a route, used for
monitoring flight progress or for navigating
around controlled airspace.
Abbreviation WP
weak weak /wik/ adjective 1. not strong
a
weak radio signal 2. overdiluted with
water or air  weak mixture a fuel/air
mixture in which there is more air than
usual
Excessive cylinder head temperatures
could be caused by prolonged
use of a weak mixture, especially at
high altitude.  weak solution a mixture
of water and some other substance
in which the amount of water is more
than usual
weaken weaken /wikən/ verb to make weak

Inflation of the de-icer boot weakens
the bond between the ice and de-icer
boot surfaces.
wear wear /weə/ noun damage or loss of
quality by use
Mishandling of aeroengines
during operation can cause
considerable damage and wear which
can shorten the life of the engine.  verb
1. to become damaged or to lose quality
because of use
The more the brakes
are used, the more they wear. 2. to have
on the body
The nature of modern jet
transport does not require the pilot to
wear an oxygen mask.
weather weather /weðə/ noun the conditions
of atmospheric temperature, pressure,
wind, moisture, cloudiness, precipitation
and visibility
Generally speaking,
weather conditions can be
described as light, moderate or severe
depending on the intensity of the conditions.
 forecast weather predicted
weather, not actual weather
weathercock weathercock /weθəkɒk/ verb to
tend to turn in the direction of the wind
weather report weather report /weðə r|pɔt/
noun an official account of weather
conditions
web web /web/ noun the main vertical
member of a beam
The web connecting
the upper and lower flanges of the
beams must be rigid enough to withstand
direct compressive loads without
buckling.
weigh weigh /we/ verb to measure how
heavy something is
A given quantity
of lead weighs more than the same
quantity of aluminium.
weight weight /wet/ noun the force with
which a body is drawn towards the centre
of the Earth
Carry-on baggage is
limited by regulations as to size and
weight and items in excess of this
should be stowed in the hold.
west west /west/ noun 1. a compass point
on the mariner’s compass 270° clockwise
from due north and directly opposite
east
In Europe, snow occurs more
frequently in the east than in the west. 2.
the direction of the setting sun  adjective
1. referring to areas or regions lying
in the west 2. the western part of a country

West Africa  adverb towards the
west
The aircraft was flying west.
westbound westbound /westbaυnd/ adjective
travelling towards the west
a westbound
flight
westerly westerly /westəli/ adjective 1. situated
towards the west 2. blowing or
coming from the west
A westerly wind
is blowing. 3. moving to the west or
towards the west
He should fly in a
westerly direction.  noun a wind which
blows or comes from the west
Temperate
westerlies occur on the side of
the sub-tropical anti-cyclonic belts
which is remote from the equator.
western western /westən/ adjective situated
in the west
Western Europe
westward westward /westwəd/ adjective
going towards the west  adverb US
same as westwards
westwards westwards /westwədz/ adverb
towards the west
Flying eastwards or
westwards for long periods of time
affects sleep patterns.
west wind west wind /west wnd/ noun a
wind blowing from or coming from the
west (NOTE: A wind is named after the
direction it comes from.)
wheel wheel /wil/ noun a circular, rotating,
load-carrying part between the tyre and
　
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