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were not allowed to continue
the course.
gradient gradient /$rediənt/ noun the rate at
which a quantity such as temperature or
pressure changes relative to change in a
given variable, especially distance

Because there is a temperature gradient
across each front it is possible to draw
isotherms which reduce in value from
warm to cold air.
A pressure gradient
occurs aloft from land to sea.
gradual gradual /$rd"uəl/ adjective happening
slowly but continuously
Loss
of cabin pressure may be gradual rather
than sudden.  gradual change a
change which takes place over a period
of time
graduate graduate /$rd"u|et/ verb 1. to be
granted an academic degree or diploma

She graduated from Oxford University
with a first class honours degree. 2.
to advance to a new level of skill,
achievement, or activity
After 50
hours of flying the single engine trainer,
the student pilots graduate to flying the
twin engine aircraft. 3. to divide into
marked intervals, especially for use in
measurement
A thermometer has a
scale graduated in degrees Celsius.
gram gram /$rm/ noun a unit of measurement
of weight, equal to one thousandth
of a kilogram. Symbol g
graph graph /$rɑf/ noun a diagram that
shows a relationship between two sets
of numbers as a series of points often
joined by a line
The graph shows the
relationship between lift and drag at
various airspeeds.
graphic graphic /$rfk/ adjective 1. 
graphic solution a technique of using
geometric constructions to solve problems

One side of the calculator has a
moveable slide which is used for the
graphic solution of triangle of velocities
problems. 2. described in vivid detail

The eye witness provided a graphic
description of the events leading to the
accident.  noun a picture used in a
computer application
The instructor’s
worksheets were greatly improved by
the incorporation of graphics to aid
comprehension of the subject matter.
grasshopper grasshopper /$rɑshɒpə/ noun a
light, unarmed military aeroplane used
for reconnaissance
graticule graticule /$rtkjul/ noun 1. a
series of fine lines in an optical instrument
such as a telescope, used for
measuring 2. the network of lines
formed by the meridians and parallels
of longitude and latitude of the Earth on
a flat sheet of paper
A graticule of
lines of latitude and longitude is imagined
to cover the Earth.
gravity gravity /$rvti/ noun 1. a natural
force of attraction which pulls bodies
towards each other and which pulls
objects on Earth towards its centre
In
order for an aeroplane to fly, lift must
overcome the force of gravity. 2. seriousness

Throughout the crisis caused
by the engine failure, the passengers
were unaware of the gravity of the situation.
gravity feed gravity feed /$rvəti fid/ noun a
feed which uses the force of gravity to
move the fuel from the tank to the carburettor
great great /$ret/ adjective 1. large in size,
quantity, number, etc.  great distances
long distances  a great deal of money
a large sum of money  great importance
enormous importance 2. very
good, enjoyable or exciting
Greenwich Mean Time Greenwich Mean Time /$rentʃ
min tam/ noun local time on the
Greenwich Meridian. Abbreviation
GMT
COMMENT: GMT is now called
Coordinated Universal Time (UTC)
and is also known as Zulu time. UTC is
107 guard
expressed in 24-hour format; for
example, 7:00 P.M. is 1900 hours
(say: nineteen hundred hours).
grid grid /$rd/ noun 1. a pattern of equally
spaced vertical and horizontal lines,
sometimes used on a map
Grid lines
facilitate the quick location of a point of
reference. 2. a metal cylinder in a cathode
ray tube 3. a pattern of equally
spaced vertical and horizontal metal
rods or bars
Lead-antimony alloy grid
plates are components in a lead-acid
battery.
ground ground /$raυnd/ noun the solid surface
of the earth
Hail being much
denser and heavier than snow, falls at a
much faster rate and can reach the
ground even with the 0° isotherm at
10,000 ft.  verb 1. to prohibit an aircraft
or member of an aircrew from flying

The pilot was grounded after failing
a medical examination. 2. US to
connect an electrical circuit to a position
of zero potential
While refuelling
a light aircraft it is important to ground
　
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