AIRMET

noun
\ˈer-ˌmet \
variants: or less commonly airmet
plural AIRMETs also airmets

Definition of AIRMET 

: a notice of potentially hazardous weather conditions (such as turbulence, icing, or low visibility) along a planned flight route that is provided to the pilot of an aircraft before takeoff — compare sigmet

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First Known Use of AIRMET

1950, in the meaning defined above

History and Etymology for AIRMET

airmen's meteorological information

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The first known use of AIRMET was in 1950

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