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English definition of “filter”

filter

noun [C] (TRAFFIC)    /ˈfɪl.tər/ US  /-t̬ɚ/ UK
a green, arrow-shaped light that is part of a set of traffic lights and tells drivers when they can turn left or right: a traffic filter a left/right filterLights, signs and markings on roads
(Definition of filter noun (TRAFFIC) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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