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English definition of “signal”

signal

noun [C] (EQUIPMENT)    /ˈsɪɡ.nəl/
equipment , especially on the side of a railway or road , often with lights , that tells drivers to stop , continue , or go more slowly : a railway signal a traffic signal a road signalRailways and railway linesLights, signs and markings on roads
(Definition of signal noun (EQUIPMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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