Try Our Apps


Pore Over vs. Pour Over


or ampère

[am-peer, am-peer] /ˈæm pɪər, æmˈpɪər/
noun, Electricity
the basic unit of electrical current in the International System of Units (SI), 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.
Origin of ampere
1881; named after A. M. Ampère


[am-peer; French ahn-per] /ˈæm pɪər; French ɑ̃ˈpɛr/
André Marie
[ahn-drey muh-ree;; French ahn-drey ma-ree] /ˈɑn dreɪ məˈri;; French ɑ̃ˈdreɪ maˈri/ (Show IPA),
1775–1836, French physicist.
Related forms
[am-peer-ee-uh n, -per-] /æmˈpɪər i ən, -ˈpɛr-/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the Web for ampère
Historical Examples
British Dictionary definitions for ampère


/ˈæmpɛə; French ɑ̃pɛr/
André Marie (ɑ̃dre mari). 1775–1836, French physicist and mathematician, who made major discoveries in the fields of magnetism and electricity


the basic SI unit of electric current; the constant current that, when maintained in two parallel conductors of infinite length and negligible cross section placed 1 metre apart in free space, produces a force of 2 × 10–7 newton per metre between them. 1 ampere is equivalent to 1 coulomb per second
a former unit of electric current (international ampere); the current that, when passed through a solution of silver nitrate, deposits silver at the rate of 0.001118 gram per second. 1 international ampere equals 0.999835 ampere
amp, A
Word Origin
C19: named after André Marie Ampère
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for ampère



1881, "the current that one volt can send through one ohm," from French ampère, named for French physicist André-Marie Ampère (1775-1836). Shortened form amp is attested from 1886.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
ampère in Medicine

ampere am·pere (ām'pēr')
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.
Cite This Source
ampère in Science
  (ām'pîr', äm-pěr')   
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 SI unit used to measure electric current. Electric current through any given cross-section (such as a cross-section of a wire) may be measured as the amount of electrical charge moving through that cross-section in one second. One ampere is equal to a flow of one coulomb per second, or a flow of 6.28 × 1018 electrons per second.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for ampere

Most English speakers likely know this word

Word Value for ampère

Scrabble Words With Friends

Nearby words for ampère