the control and navigation of an aircraft by reference to its gauges, with no or only limited visual reference outside the cockpit.
Origin of instrument flying
First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the navigation of an aircraft by the use of instruments only
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