1753, "a sum (of cash) put in, a sharing, contribution," from verbal phrase; see in (adv.) + put (v.). Meaning "energy supplied to a device or machine" is from 1902, later of electronic devices; computing sense of "data fed into a machine" is from 1948, though this is perhaps from the verb in the computing sense.
late 14c., "put on, impose," from in (adv.) + put (v.). Modern sense "feed data into a machine" is from 1946, a new formation from the same elements.
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