1. (used with a sing. verb) The science and technology of electronics and the development of electronic devices as applied to aeronautics and astronautics: Avionics has become even more important with the development of the space program.
2. (used with a pl. verb) The electronic systems, equipment, and other devices so developed: The avionics on this spacecraft represent a new generation of sophistication.

[AVI(ATION) + (ELECTR)ONICS.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.