Etymology
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equalizer (n.)

1792, agent noun from equalize. Sports sense attested by 1930; in the U.S. underworld slang sense of "pistol," it is from c. 1900.

updated on September 16, 2012

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Definitions of equalizer from WordNet

equalizer (n.)
electronic equipment that reduces frequency distortion;
Synonyms: equaliser
equalizer (n.)
a weight that balances another weight;
Synonyms: counterweight / counterbalance / counterpoise / balance / equaliser
equalizer (n.)
a score that makes the match even;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.