(used with a singular verb) the science dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.
Main Entry: elec·tron·ics Pronunciation: -iks Function: noun plural 1singular in construction: a branch of physics thatdeals with the emission, behavior, and effects of electrons (as in electron tubes and transistors) and with electronic devices 2: electronic devices or equipment
[i-lek-tron-iks, ee-lek-] 
) the science dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.