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an orifice which leads to the expansion
chamber.
origin origin /ɒrd"n/ noun 1. a source, the
place where something starts
An air
mass takes on the characteristics of its
place of origin. 2. the base from which
a map projection is drawn
The value
of convergence used is correct at the
parallel of origin.
original original /ə|rd"ən(ə)l/ adjective
before all others, the first
The atmosphere
is said to be stable if, when a parcel
of air is displaced vertically, it tends
to return to its original level.
originate originate /ə|rd"net/ verb to be created
or to come into being
Tropical
revolving storms originate within 5–15°
of the equator.
Aircraft fires after an
orographic 164
emergency landing, often originate in
the wing area.
orographic orographic /ɒrə|$rfk/ adjective
referring to mountains  orographic
uplift the lifting of air masses in contact
with mountain regions
orographic cloud orographic cloud /ɒrəυ$rfk
klaυd/ noun a cloud formed by air
being forced upward over mountainous
areas
orthomorphic orthomorphic /ɔθəυ|mɔfk/
adjective of the correct shape
An
orthomorphic chart is one which has
meridians and parallels which intersect
at right angles and, at any point on the
chart, the scale must be the same in all
directions.
orthomorphism orthomorphism /ɔθəυ|
mɔfz(ə)m/ noun a shape representation
on a map
Orthomorphism means
that bearings may be measured correctly
at any point on a chart.
oscillate oscillate /ɒslet/ verb 1. to move
regularly between extremes 2. to
increase or decrease regularly so as to
produce oscillations
Instability protection
is incorporated to guard against
oscillating outputs from the alternators.
oscillation oscillation /ɒs|leʃ(ə)n/ noun 1. a
regular movement between extremes

Ridge waves can be thought of as oscillations
about the stable state of the
undisturbed air flow with the range of
hills providing the disturbance. 2. a regular
increase and decrease of electrical
current
The supply is subject to oscillation.
oscillator oscillator /ɒsletə/ noun an electronic
circuit that produces a pulse or a
signal at a particular frequency
The
local oscillator replicates the radio frequency
of the frequency generator at
the transmitter.
out out /aυt/ adverb  out of away from,
no longer in
outboard outboard /aυtbɔd/ adverb in a
direction away from the centre of an aircraft
 adjective situated away from the
main body of an aircraft and towards
the wing tips
outbound outbound /aυtbaυnd/ adjective,
adverb towards a destination away from
a VOR
The aircraft flies outbound
from the beacon along the airway and
inbound to the facility at the other end
of the leg.  outbound traffic aircraft
flying away from an airfield
outbreak outbreak /aυtbrek/ noun a sudden
start
Showers are local outbreaks of
precipitation from detached cumulus or
cumulonimbus.
Hand operated fire
extinguishers are provided to combat
any outbreaks of fire in the flight crew
compartment and passengers cabins.
outer outer /aυtə/ adjective 1. external

Pneumatic de-icer boots are made from
vulcanised rubber fabric with an outer
covering of neoprene. 2. positioned
away from the centre
Winds near anticyclones
are normally light near the
centre, but tend to be stronger towards
the outer edges. 3.  outer wing the part
of the wing nearest the tip
outer marker outer marker /aυtə mɑkə/ noun
an ILS marker beacon, usually on centre
line of approach at about 4.5 nm
from the runway threshold
outflow outflow /aυtfləυ/ noun flow in an
outward direction
The outflow valve is
controlled by the cabin pressure controller.
outgoing outgoing /aυt|$əυŋ/ adjective going
out
There is a fall of temperature until
about one hour after dawn when incoming
solar radiation balances outgoing
terrestrial radiation. Opposite incoming
outlet outlet /aυtlət/ noun a passage for exit
or escape
The air leaves the compressor
outlet and passes through a matrix
　
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