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the new runway. 3. as opposed to in
contrast with over sea as opposed to
over land
opposite /ɒpəzt/ 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|zʃ(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 /ɒptməm/ 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 /ɔbt/ 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$əna|zeʃ(ə)n/,
organization noun 1. an association of
people working together for the same
cause The World Meteorological
Organization The International Civil
Aviation Organization 2. the act of
putting things into a structured and systematic
form The organisation of
training materials for the new selfaccess
learning centre is under way. 3.
planning Captain Scott is responsible
for the organisation of examinations.
organise organise /ɔ$ənaz/, 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 /ɔriəntet/ 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|teʃ(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 /ɒrfs/ noun an opening,
mouth or vent The liquid expands and
builds up a pressure differential across
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Dictionary of Aviation下(28)
