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places correct to three figures after the
decimal point
2.754 is correct to three
decimal places, 2.7 is correct to one
decimal place.
decimal notation decimal notation /desm(ə)l nəυ|
teʃ(ə)n/ noun the method of writing a
number in the decimal system
The
fraction 3/4 can be written as 0.75 in
decimal notation.
Prices and number
are normally written using decimal
notation.
He finds it difficult to understand
how the computer works because
it uses binary not decimal notation.
decimal place decimal place /desm(ə)l ples/
noun the position of a number to the
right of the decimal point
decimal point decimal point /desm(ə)l pɔnt/
noun the dot (.) used to separate a whole
number from a decimal fraction
COMMENT: The decimal point is used
in the USA and Britain. In most
European countries a comma (,) is
used to show the decimal, so 4,75% in
Germany is written 4.75% in Britain.
decimal system decimal system /desm(ə)l
sstəm/ noun system of counting
based on the number 10 and using the
digits 0 – 9
decision decision /d|s"(ə)n/ noun the act of
deciding or of making up one’s mind 
to make a decision to choose a course
of action
The decision to evacuate the
aircraft was made by the captain.
decision height decision height /d|s"(ə)n hat/
noun the altitude at which, during an
ILS landing approach, a pilot must
decide whether to land or carry out a
missed approach
The pilot waited
until she was at decision height before
initiating the missed approach procedure.
Abbreviation DH
COMMENT: An ILS approach generally
has a decision height of 200 ft (60 m)
above ground level.
deck deck /dek/ noun the floor of a ship or
aircraft
decode 66
decode decode /di|kəυd/ verb to change
coded information into readable form

Incorrectly spaced information pulses
can result in failure by the ground station
to decode the aircraft information.
decoder decoder /di|kəυdə/ noun a device
used to decode signals from the air traffic
control radar beacon system
The
aircraft receiver is set to the required
frequency and linked to a selective call
system decoder which has a 4-letter
code.
decrease decrease noun /dikris/ a lessening
or reduction
A decrease in power
results in the aircraft descending. 
verb /d|kris/ to become less, to fall

Air density and pressure decrease with
an increase in altitude.  opposite (all
senses) increase
deduce deduce /d|djus/ verb to work something
out in the mind using information
provided
Sometimes, it is possible to
estimate the depth of the layer of mist or
fog from the ground observations and
hence to deduce the ground range from
any height.
defect defect /difekt/ noun a fault or error

Low oil pressure or excessive temperature
indicate the development of a possible
defect.
defective defective /d|fektv/ adjective faulty
or not operating correctly
Loss of supply
pressure is caused by either a defective
booster pump or lack of fuel.
define define /d|fan/ verb 1. to give an
exact explanation, as in a dictionary  it
is not easy to define the word it is difficult
to say exactly what the word
means 2. to set the limits of something

Cloud tops are very difficult to define.
definite definite /def(ə)nət/ adjective referring
to something which is not in doubt,
which is certain
Using a time scale on
the track, the pilot should be prepared
to look for a definite feature at a definite
time. Opposite indefinite
definition definition /def|nʃ(ə)n/ noun an
exact explanation of what a word or
expression means
The definition of a
year is the time taken for a planet to
describe one orbit around the sun.  by
definition understood by the use of the
word itself
A sphere is, by definition,
round.
deflate deflate /di|flet/ verb to allow air to
escape from something, so that it
becomes smaller or collapses. Opposite
inflate  to deflate a tyre to allow the
air to escape from a tyre
deflation deflation /di|fleʃ(ə)n/ noun the act
of allowing air to escape from something,
so that it becomes smaller or collapses

Deflation of a tyre is done by
　
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本文鏈接地址：Dictionary of Aviation上(62)