amp

The term originates from the name of French physicist André-Marie Ampère (1775–1836), a pioneer in electromagnetism. The unit of electric current, the "ampere", was named in his honor in the late 19th century. The clipped form "amp" emerged in the early 20th century as a convenient shorthand in electrical engineering. By the mid-20th century, the same clipped form was independently applied to "amplifier", reflecting the device's function of increasing the amplitude, or strength, of an electrical signal, particularly in audio contexts.

The word "amp" is a clipped form, not composed of multiple morphemes in the traditional sense. It is a direct shortening of the word "ampere" (for definition 1) and "amplifier" (for definition 2).