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X-plane

Noun CEFR B1

Definitions

Any of a series of experimental aircraft and rockets, used to test and evaluate new technologies and aerodynamic concepts.

US

Equivalents

CEFR level

B1
Intermediate
This word is part of the CEFR B1 vocabulary — intermediate level.
See all B1 English words →

See also

X-Position X-radiation X-ray X-ray absorbing glass X-ray astronomy X-ray binary

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