Pronunciation: /ˈiːkwəlʌɪzə/
(also equaliser)
noun
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1a thing which has an equalizing effect: education is the great equalizer
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British a goal that levels the score in the game: his second goal was the equalizer
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2North American informal a weapon, especially a gun.
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3 Electronics a passive network designed to modify a frequency response, especially to compensate for distortion.