from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of electric current in the meter-kilogram-second system. It is the steady current that when flowing in straight parallel wires of infinite length and negligible cross section, separated by a distance of one meter in free space, produces a force between the wires of 2 × 10-7 newtons per meter of length.
  • n. A unit in the International System specified as one International coulomb per second and equal to 0.999835 ampere. See Table at measurement.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of electrical current, the standard base unit in the International System of Units. Abbreviation: amp, Symbol: A

from The Century Dictionary and Cyclopedia

  • n. The unit employed in measuring the strength of an electrical current. It is the current which flows through a conductor whose resistance is one ohm, and between the two ends of which the unit difference of potentials, one volt, is maintained.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a former unit of electric current (slightly smaller than the SI ampere)
  • n. the basic unit of electric current adopted under the Systeme International d'Unites


After André Marie Ampère.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after the French physicist André-Marie Ampère. (Wiktionary)



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