equalizer

noun

1. One who makes equal; a balancer.

   “Death is the great equalizer.”

   “The Internet serves as an equalizer of sorts against common discriminations based on race, gender and age. You have to^([sic]) the opportunity to assess someone based on what they are saying, not WHO is saying it. I think this can provide for some very worthwhile exchanges and allow people who might not do so otherwise, to come to know each other. The downside is that as they say, on the Internet, nobody knows you're a dog. You can lie or say whatever you want and hide behind anonymity.”

   “Practically, it can be seen clearly that weeder courses are not equalizers. In fact, they exacerbate inequality and continue to push wealthy and privileged students to the top while putting down minority and low-income students.”

2. A device that balances various quantities.
3. A goal, run, point, etc. that equalizes the score.

   “[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.”

   “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.”

4. An electronic audio device for altering the frequencies of sound recordings.

   “Several digital effects are supported by Deck, ranging from a digital equalizer, which lets you accentuate or attenuate certain frequencies, to a stereoizer, which processes a mono- phonic recording to simulate stereo.”

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. A set of arguments where two or more functions have equal values; the solution set of an equation.
10. 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.

    “Familiar epithets for the revolver were equalizer, shootin' iron . . . smoke wagon.”