Short for amplifier, a device that increases the power of electrical signals, especially audio signals. Also short for ampere, the unit of electric current.
Shortened form of 'amplifier' (1960s) or 'ampere' (early 20th century). 'Amplifier' comes from Latin 'amplificare' meaning 'to enlarge', while 'ampere' honors French physicist André-Marie Ampère who studied electromagnetism.
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