noun Electricity.
the ratio of an impressed charge on a conductor to the corresponding change in potential.
the ratio of the charge on either conductor of a capacitor to the potential difference between the conductors.
the property of being able to collect a charge of electricity. Symbol: C

1905–10; capacit(y) + -ance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
capacitance (kəˈpæsɪtəns)
1.  the property of a system that enables it to store electric charge
2.  a measure of this, equal to the charge that must be added to such a system to raise its electrical potential by one unit
[C20: from capacit(y) + -ance]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1893, from capacity (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
capacitance   (kə-pās'ĭ-təns)  Pronunciation Key 
A measure of the ability of a configuration of materials to store electric charge. In a capacitor, capacitance depends on the size of the plates, the type of insulator, and the amount of space between the plates. Most electrical components display capacitance to some degree; even the spaces between components of a circuit have a natural capacitance. Capacitance is measured in farads. Compare inductance.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When one or both are pressed, the distance between them gets smaller,
  increasing the capacitance of the sensor.
As it does so, devices called capacitance sensors check on its position with
  respect to the surrounding satellite.
Some of the early designs measured the change in electrical resistance or
  capacitance on a surface when fingers touched it.
Fingers create a tiny electrical field that changes the capacitance of the
  array, depending on their distance from it.
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