noun Aviation.
gasoline for use in piston-engined aircraft.

1940–45; av(iation) + gas(oline)

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Based on the Random House Dictionary, © Random House, Inc. 2015.
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American Heritage
Abbreviations & Acronyms
aviation gasoline
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Apart from one jet, all the planes on the apron had two things in common: a piston engine, and a dire need for avgas.
The use of a diesel was based on the scarcity of avgas.
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