equaliser

noun11

1. •
   One who makes equal; a balancer.

   • Death is the great equalizer.
2. •
   A goal, run, point, etc. that equalizes the score.

   • 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
3. •
   An electronic audio device for altering the frequencies of sound recordings.
4. •
   A device that balances various quantities.
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. •
   (US, slang) A weapon, usually a blackjack or gun.

   • Familiar epithets for the revolver were equalizer, shootin' iron . . . smoke wagon. — 1950
10. •
    A set of arguments where two or more functions have equal values; the solution set of an equation.
11. •
    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.