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the new runway. 3.  as opposed to in
contrast with
over sea as opposed to
over land
opposite /ɒpəzt/ adjective 1. situated
or placed directly across from
something, facing  opposite sides of a
building the back and front of a building
2. completely different, the reverse

For every action there is an equal and
opposite reaction.  noun something
completely different, the reverse
The
opposite of a katabatic wind is an anabatic
wind.
The opposite of starboard
is port.
going in opposite directions
1. moving away from each other
2. moving towards each other
opposition opposition /ɒpə|zʃ(ə)n/ noun  in
opposition against
Drag acts in opposition
to thrust.
The electromotive
force that is produced by all motors is in
opposition to supply voltage and is
163 originate
directly proportional to motor rpm (revolutions
per minute).
optimum optimum /ɒptməm/ adjective referring
to the point at which the condition
or amount of something is the best

The optimum altitude for jet aircraft is
higher than that for piston engine aircraft.
 noun the point at which the condition
or amount of something is the
best
Generally speaking, engine output
is at its optimum at cruising speed.
option option /ɒpʃən/ noun a choice or
alternative
On a bad approach, the
pilot of a powered aircraft always has
the option of going around.
He was
given the option of buying two aircraft
instead of one.
orbit orbit /ɔbt/ noun the path of a planet,
or of a satellite. as it moves around
another celestial body.
A year is the
time taken for the Earth to complete one
orbit round the sun.  to put into orbit,
to send into orbit to launch something
into space so that it revolves around a
celestial body such as the sun  verb to
revolve around
The Earth orbits the
sun. (NOTE: orbiting – orbited)
order order /ɔdə/ noun 1. an instruction
given as a command by somebody in
authority
The captain gave the order
to evacuate the aircraft. 2. the sequence
of occurrence
The firing order of
sparking plugs in a piston engine is 1, 3,
4, 2.  alphabetical order arrangement
in which words beginning with letter A
come first, followed by those beginning
with letter B, then C, etc.  numerical
order arrangement in which the lowest
numbers (1, 2, 3, etc.) come first and
higher numbers (25, 26, 27, etc.) come
later 3. a condition or state
Although
the aircraft is old, it is in good working
order.  out of order not working
The
telephone is out or order. 4.  in the
order of approximately
VOR (very
high frequency omni-directional radio
range) beacons of 200 watts have a
range in the order of 200 nm (nautical
miles).  in order to so as to
Indicated
airspeed must be corrected in order to
obtain true airspeed.  verb 1. to give a
command
Before impact, the captain
will order the crew to secure themselves
at their assigned emergency stations. 2.
to put in a sequence
Order the items in
importance from 1 to 10.
organisation organisation /ɔ$əna|zeʃ(ə)n/,
organization noun 1. an association of
people working together for the same
cause
The World Meteorological
Organization
The International Civil
Aviation Organization 2. the act of
putting things into a structured and systematic
form
The organisation of
training materials for the new selfaccess
learning centre is under way. 3.
planning
Captain Scott is responsible
for the organisation of examinations.
organise organise /ɔ$ənaz/, organize verb
1. to arrange into a system
Organise
your notes so that you can find things
easily. 2. to plan
The trip was well
organised and everybody enjoyed themselves.
orientate orientate /ɔriəntet/ verb to locate
in relation to the compass
The first
step in map reading is to orientate the
chart by relating the direction of land
features to their representation on the
chart.
orientation orientation /ɔriən|teʃ(ə)n/ noun a
position in relation to the compass

The horizontal situation indicator (HSI)
presents a selectable, dynamic colour
display of flight progress and plan view
orientation.
orifice orifice /ɒrfs/ noun an opening,
mouth or vent
The liquid expands and
builds up a pressure differential across
　
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