"electronics applied to aviation," 1949, from aviation + electronics.
Entries linking to avionics
aviation n.
"art or act of flying," 1866, from French aviation, noun of action from stem of Latin avis "bird" (from PIE root *awi- "bird"). Coined in 1863 by French aviation pioneer Guillaume Joseph Gabriel de La Landelle (1812-1886) in "Aviation ou Navigation aérienne."
electronics n.
1910, from electronic; also see -ics. The science of how electrons behave in vacuums, gas, semi-conductors, etc.