Real Dictionary

ampere-hour in American English
a standard unit for measuring the quantity of electricity, equal to the flow of a current of one ampere for one hour, or to an elapsed current drain of 3,600 coulombs
noun: a unit of electric charge noting the amount of electricity transferred by a current of one ampere in one hour, equal to 3600 coulombs

ampere-hour in British English
noun: a practical unit of quantity of electricity; the quantity that flows in one hour through a conductor carrying a current of 1 ampere. 1 ampere-hour is equivalent to 3600 coulombs

ampere-hour in Electrical Engineering
noun: An ampere-hour is a measure of charge or current flow over time.