definitions

auxiliary power unit

noun

an additional engine fitted to an aircraft to operate when the main engines are not in use

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Nearby words

auxiliaries, auxiliary, auxiliary equation, auxiliary language, auxiliary note, auxiliary power unit, auxiliary rafter, auxiliary rotor, auxiliary storage, auxiliary tone, auxiliary verb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012