[ih-lek-tron-iks, ee-lek-]
(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.

1905–10; see electronic, -ics

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World English Dictionary
electronics (ɪlɛkˈtrɒnɪks, ˌiːlɛk-)
1.  (functioning as singular) the science and technology concerned with the development, behaviour, and applications of electronic devices and circuits
2.  (functioning as plural) the circuits and devices of a piece of electronic equipment: the electronics of a television set

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1910, from electronic; cf. also -ics. The science of how electrons behave in vacuums, gas, semi-conductors, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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