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1
English
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1.1
Noun
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X-plane
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From Wiktionary, the free dictionary
English
[
edit
]
English
Wikipedia
has an article on:
List of X-planes
Wikipedia
Noun
[
edit
]
X
-
plane
(
plural
X-planes
)
(
US
,
military
)
Any of a series of
experimental
aircraft
and
rockets
, used to test and evaluate new technologies and aerodynamic concepts.
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en:Military
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