Webster's English Dictionary

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capacitance

ca.pac.i.tance \k*-'pas-*t-*n(t)s\ \-'pas-*t-iv\ n [capacity] 1a: the 
   property of an electric nonconductor that permits the storage of en ergy as 
   a result of electric displacement when opposite surfaces of the 
   nonconductor are maintained at a difference of potential 1b: the measure of 
   this property equal to the ratio of the charge on either  surface to the 
   potential difference between the surfaces 2: a part of a circuit or network 
   that possesses capacitance  - ca.pac.i.tive aj