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1839, from out + put (v.). Till c.1880, a technical term in the iron and coal trade [OED]. The verb is attested from mid-14c., originally "to expel;" meaning "to produce" is from 1858.
output out·put (out'put')n. The amount produced, ejected, or excreted by an entity during a specified time.
The energy, power, or work produced by a system or device.
The information that a computer produces by processing a specific input.
architecture Data transferred from a computer system to the outside world via some kind of output device. Opposite: input. (1997-04-28)