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English definition of “signal”

signal

noun [C]
 
 
/ˈsɪɡnəl/
ACTION B2 a movement, light, or sound that gives information, or tells people what to do: At a signal from their teacher, the children all held up their flags. Don't move until I give the signal.Signs, signals and symbolsSpecific signs and symbolsLights, signs and markings on roadsCommunications technology - general words
WAVE B2 a series of electrical waves that are sent to a radio, television, or mobile phoneCommunications technology - general words
PROOF something that shows that something else exists or is likely to happen: The changing colour of the leaves on the trees is a signal that it will soon be autumn.Signs, signals and symbolsSpecific signs and symbols
TRAINS a piece of equipment that tells trains to stop or to continueRailways and railway lines
VEHICLES/PEOPLE US a piece of equipment that shows people or vehicles when to stop, go, or move carefully: a traffic signal Signs, signals and symbolsSpecific signs and symbolsLights, signs and markings on roads
(Definition of signal noun from the Cambridge Learners Dictionary © Cambridge University Press)
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