the amount of current flowing through a given cross-sectional area in a given time interval: usually measured in amperes per square centimeter.
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Examples from the Web for current density
The dependence of the mechanical qualities of the copper upon the current-density employed is well known.
British Dictionary definitions for current density
the ratio of the electric current flowing at a particular point in a conductor to the cross-sectional area of the conductor taken perpendicular to the current flow at that point. It is measured in amperes per square metreSymbol: J
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012