Definition of "equalizer"

equalizer

noun
plural equalizers
1. One who makes equal; a balancer.
2. A device that balances various quantities.
3. (sports) A goal, run, point, etc. that equalizes the score.
  Quotations
  [Bendtner was central to it at all, firstly firing home, via a deflection off Gareth McAuley, after being teed up by Sebastien Larsson's neat backheel, and then a minute later crossing for Elmohamady to head in an equaliser.
  2011 October 1, Phil Dawkes, “Sunderland 2 - 2 West Brom”, in BBC Sport‎
  Mariners scored a run in the seventh inning and the equaliser in the top of the ninth, after Braves’ starting pitcher Ashley Crump had dominated—throwing six scoreless innings for just two hits.
  2011 May 16, Mike Driscoll, “Pirates plunder top spot with late attack”, in Illawarra Mercury‎, page 36
4. An electronic audio device for altering the frequencies of sound recordings.
5. A device, such as a bar, for operating two brakes, especially a pair of hub brakes for an automobile, with equal force.
6. Any device for equalizing the pull of electromagnets.
7. A conductor of low resistance joining the armature ends of the series field coils of dynamos connected in parallel.
8. A sliding panel to preserve the lateral stability of an aeroplane.
9. (mathematics) A set of arguments where two or more functions have equal values; the solution set of an equation.
10. (category theory) A morphism whose codomain is the domain of a parallel pair of morphisms and which forms part of the limit of that parallel pair. Equivalently, a morphism which equalizes a parallel pair of morphisms in a limiting way, which is to say that any other morphism which equalizes that parallel pair factors through this limiting morphism; and moreover such factorization is unique.
11. (Canada, US, slang) A weapon, usually a blackjack or gun.