Etymology
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amp (n.)

1886 as an abbreviation of ampere; 1967 as an abbreviation of amplifier.

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amplifier (n.)

1540s; agent noun from amplify. Electronic sense is from 1914; shortened form amp is from 1967. Alternative stentorphone (1921) did not catch on.

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preamplifier (n.)

"a device designed to amplify a weak source and pass it to another amplifier," 1929, from pre- + amplifier. Shortened form pre-amp is attested by 1957.

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ampere (n.)

1881, "the current that one volt can send through a resistance of one ohm," from French ampère, named for French physicist André-Marie Ampère (1775-1836). Adopted by the Electric Congress at Paris in 1881. Shortened form amp is attested from 1886.

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