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The Collaborative International Dictionary of English v.0.48 (gcide)

Ampere \Am`p[`e]re"\ ([aum]N`p[^a]r"), Ampere \Am*pere"\
([a^]m*p[=a]r"), n. [From the name of a French electrician.]
(Elec.)
The unit of electric current; -- defined by the International
Electrical Congress in 1893 and by U. S. Statute as, one
tenth of the unit of current of the C. G. S. system of
electro-magnetic units, or the practical equivalent of the
unvarying current which, when passed through a standard
solution of nitrate of silver in water, deposits silver at
the rate of 0.001118 grams per second. Called also the
{international amp[`e]re}.
[1913 Webster]