equalizer

1. (sports) A goal, run, point, etc. that equalizes the score.Examples: "[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."

2. (music, electronics) An electronic audio device for altering the frequencies of sound recordings.Examples: "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."

3. (mathematics) A set of arguments where two or more functions have equal values; the solution set of an equation.

4. (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.

5. (Canada, US, slang) A weapon, usually a blackjack or gun.Examples: "Familiar epithets for the revolver were equalizer, shootin' iron . . . smoke wagon."CanadaUSslang