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Meaning of “signal” - Learner’s Dictionary

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 Learner’s Dictionary © Cambridge University Press)
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