[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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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Example sentences
Unplug all appliances, personal audio devices and electronics from the outlet
  while out sightseeing.
Advanced automotive electronics used to mean digital dashboard displays or
  electronic fuel injection.
Find resources for recycling computers, televisions and other electronics.
The economy depends heavily on exports, particularly in consumer electronics
  and information technology products.
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