adjective Electronics.
designating or pertaining to electronic devices, as transistors or crystals, that can control current without the use of moving parts, heated filaments, or vacuum gaps.

1965–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  (modifier) (of an electronic device) activated by a semiconductor component in which current flow is through solid material rather than in a vacuum
2.  (modifier) of, concerned with, characteristic of, or consisting of solid matter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Most electronic devices have moved into the era of silicon chips and other
  solid-state technology.
All of those portable beer coolers that plug into a cigarette lighter use a
  solid-state refrigeration module.
Solid-state lasers can produce light in the red and blue parts of the spectrum
  but not the green.
They produced much better images than could be obtained with other kinds of
  solid-state sensors, and they took off.
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