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attract each other because of polar
differences.
polar diameter polar diameter /pəυlə da|mtə/
noun the distance from one pole, passing
through the centre of the Earth, to
the other pole
The Earth’s polar
diameter is shorter than its average
equatorial diameter.
polar ice cap polar ice cap /pəυlə as kp/
noun the permanent area of ice at north
or south pole
polarisation polarisation /pəυləra|zeʃ(ə)n/,
polarization noun 1. a characteristic of
light or radio or other electromagnetic
waves in which the waves are aligned in
one direction and show different properties
in different directions
The
antenna must have the same effective
length and the same polarisation as the
transmitter. 2. partial or complete polar
separation of positive and negative electric
charge
polarise polarise /pəυləraz/, polarize verb
1. to align in one plane
The frequency
allocation for VOR (very high frequency
omni-directional radio range) is
108–117.975 MHz (megahertz) and
transmissions are horizontally polarised.
2. to separate positive and negative
electric charges
polarity polarity /pəυ|lrti/ noun the direction
of flow of flux or current in an
object
During discharge, when the
pole 174
polarity of the supply changes, the
stored energy is returned to the supply.
 polarity test a test to see which terminal
is positive and which is negative
pole pole /pəυl/ noun 1. the north or south
point of the Earth’s axis
A meridian is
a line joining pole to pole. 2. a terminal,
e.g. of a battery
negative pole
positive
pole 3. a long, rounded piece of
wood or metal
a flag pole
pollution pollution /pə|luʃ(ə)n/ noun the presence
of unusually high concentrations
of harmful substances in the environment
pontoon pontoon /pɒn|tun/ noun same as
float
poor poor /pɔ/ adjective bad
poor
weather conditions
poor visibility

Air is a poor conductor.
poppet valve poppet valve /pɒpt vlv/ noun an
intake or exhaust valve of a piston
engine, operated by springs and cams
porous porous /pɔrəs/ adjective referring to
substances which allow fluid to pass
through them
The de-icing fluid
passes through a porous plastic sheet.
port port /pɔt/ noun 1. an entrance which
is opened periodically
inlet port
As
a piston in the pump moves outwards
into its cylinder, it covers the inlet port
and forces fluid out of the top of the cylinder.
2. the left-hand side of an aircraft
when facing forwards when inside the
aircraft
Unless an aircraft is flying in
the same or exactly opposite direction
to the wind, it will experience either
port or starboard drift. Opposite starboard
portable portable /pɔtəb(ə)l/ adjective capable
of being carried in the hands
a
portable fire extinguisher
The aneroid
barometer is a more portable device
than a mercury barometer.
portable electronic device portable electronic device
/pɔtəb(ə)l lektrɒnk d|vas/ noun
a piece of electronic equipment such as
a mobile phone or laptop which is small
enough to be carried onboard an aircraft,
and which may cause problems
with the aircraft’s systems during flight.
Abbreviation PED
portion portion /pɔʃ(ə)n/ noun a part or section

A hailstone starts as a small ice
particle in the upper portion of a cumulus
cloud.
position /pə|zʃ(ə)n/ noun 1. a place
or location where something is
The
Greenwich or prime meridian and the
equator are the axes of the system
called latitude and longitude which is
used for expressing position on the
Earth. 2. the setting of a control, etc.

the neutral position 3.  in a sitting
position seated  verb to place something
in a special location
The magnetic
compass is positioned away from
magnetic sources.
position line position line /pə|zʃ(ə)n lan/ noun
a line along which an aircraft is known
to be at a particular time, usually by taking
a VOR bearing. Also called line of
position, navigational line
position report position report /pə|zʃ(ə)n r|pɔt/
noun a report over a known location as
transmitted by an aircraft to an air traffic
　
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