Definition of Air Force One noun from the Oxford Advanced Learner's Dictionary

 

Air Force One

 noun
noun
BrE
 
; NAmE
 
The air force
 
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the name given to a special aircraft in the US air force when the US President is using it See related entries: The air force Culture The first such plane was provided in 1944 for Franklin D Roosevelt, but the first to be called Air Force One was the one provided for John F Kennedy in 1961.
See the Oxford Advanced American Dictionary entry: Air Force One