Etymology
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amp (n.)

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

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Definitions of amp

amp (n.)
the basic unit of electric current adopted under the Systeme International d'Unites;
a typical household circuit carries 15 to 50 amps
Synonyms: ampere / a
amp (n.)
a nucleotide found in muscle cells and important in metabolism; reversibly convertible to ADP and ATP;
Synonyms: adenosine monophosphate / adenylic acid
From wordnet.princeton.edu