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

  • n. A gap in an otherwise complete electric circuit across which a discharge occurs at a prescribed voltage.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A gap, between two electrical terminals, across which sparks are generated.
  • n. Such a gap as a component of an engine's ignition system, especially that between the electrodes of a spark plug.

from the GNU version of the Collaborative International Dictionary of English

  • The space filled with air or other dielectric between high potential terminals (as of an electrostatic machine, induction coil, or condenser), through which the discharge passes; the air gap of a jump spark.

from The Century Dictionary and Cyclopedia

  • n. The open space between the terminals of the secondary circuit of an induction-coil, or the similar space in any electric circuit, across which the disruptive electric discharge in the form of a spark takes place.

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

  • n. the gap between two high-potential terminals
  • n. a component of an ignition system; consists of two shaped electrodes and the space between them


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