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amp.

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am⋅per⋅age

  [am-per-ij, am-peer-]
–noun Electricity.
the strength of an electric current measured in amperes. Abbreviation: amp.
Origin:
1890–95; ampere + -age

am⋅pere

  [am-peer, am-peer]
–noun Electricity.
the base SI unit of electrical current, equivalent to one coulomb per second, formally defined to be the constant current which if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed one meter apart in vacuum, would produce between these conductors a force equal to 2 × 10−7 newton per meter of length. Abbreviation: A, amp.
Also, ampère.

Origin:
1881; named after A. M. Ampère
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

ampere 
1881, "the current that one volt can send through one ohm," from Fr. ampère, from André M. Ampère (1775-1836), Fr. physicist. Shortened form amp is attested from 1886.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: am·per·age
Pronunciation: 'am-p(&-)rij, -"pi(&)r-ij
Function: noun
: the strength of a current of electricity expressed inamperes

Main Entry: am·pere
Pronunciation: 'am-"pi(&)r also -"pe(&)r
Function: noun
1 : the practical mks unit of electric current thatis equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied across a resistance of one ohm
2 : the base unit of electric current in theInternational System of Units that is equal to a constant current which when maintained in two straight parallel conductors of infinite length and negligible circular sections one meter apart in avacuum produces between the conductors a force equal to 2 × 10−7newton per meter of length
Amápère /än-per/,André Marie (1775–1836), French physicist. Ampère is credited with founding, naming, and developing the science of electrodynamics. He was the formulator of two lawsin electromagnetism relating magnetic fields to electric currents. The first person to develop techniques for measuring electricity, he invented an instrument that was a forerunner of the galvanometer.In 1881 at the suggestion of Sir Charles Bright, an international congress on electricity adopted ampere as a term for the standard unit of electric current.
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

ampere am·pere (ām'pēr')
n.
Abbr. A

  1. A unit of electric current in the meter-kilogram-second system, equal to the current that, flowing in two parallel wires one meter apart, produces a force of 2 × 10-7 newtons per meter.

  2. A unit in the International System specified as one International coulomb per second and equal to 0.999835 ampere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
Ampère   (ām'pîr', äm-pěr')  Pronunciation Key 
French mathematician and physicist who is best known for his analysis of the relationship between magnetic force and electric current. He formulated Ampère's law, which describes the strength of the magnetic field produced by the flow of energy through a conductor. The ampere unit of electric current is named for him.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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