noun Electricity.
a device for accumulating and holding a charge of electricity, consisting of two equally charged conducting surfaces having opposite signs and separated by a dielectric.
Also called condenser.

1925–30; capacit(y) + -or2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
capacitor (kəˈpæsɪtə)
Former name: condenser a device for accumulating electric charge, usually consisting of two conducting surfaces separated by a dielectric

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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Word Origin & History

"device which stores electricity," 1926, from capacity (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
capacitor  [%PREMIUM_LINK%]     (kə-pās'ĭ-tər)  Pronunciation Key 

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An electrical device consisting of two conducting plates separated by an electrical insulator (the dielectric), designed to hold an electric charge. Charge builds up when a voltage is applied across the plates, creating an electric field between them. current can flow through a capacitor only as the voltage across it is changing, not when it is constant. Capacitors are used in power supplies, amplifiers, signal processors, oscillators, and logic gates. Compare induction coil, resistor.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
capacitor [(kuh-pas-i-tuhr)]

A device used in electrical circuits. The capacitor stores an electrical charge for short periods of time, and then returns it to the circuit.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for capacitors
Lc coupled amplifier, using a network of inductors and capacitors.
The capacitors were of a special design, small with high insulation.
These capacitors consisted of plates in oil that were movable.
The ends of the primaries not connected with the capacitors are led to a spark
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