a member of an aircraft crew responsible for the mechanical systems, fueling, and servicing of the craft.
Origin of flight engineer
First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the member of an aircraft crew who is responsible for the operation of the aircraft's systems, including the engines, during flight
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