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am·pere-hour | \ ˈam-ˌpir-ˈau̇(-ə)r 
also -ˌper- \
also -ˌper- \Definition of ampere-hour
: a unit quantity of electricity equal to the quantity carried past any point of a circuit in one hour by a steady current of one ampere
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The first known use of ampere-hour was in 1883
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