From International Dictionary of Marine Aids to Navigation
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1 The process by which a cell or battery delivers current to an external circuit. A discharge may be continuous or intermittent.

2 The quantity of electricity that is removed from a cell or battery while current is delivered to an external circuit.

It is usually measured in ampere-hours.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM