Meaning of “signal” - Learner’s Dictionary


noun [ C ] us uk /ˈsɪɡnəl/
Extra Examples
That light is a signal that the studio is being used.The flare was a signal that the ship was in trouble.Dogs can learn to respond to even the slightest signals.Her body language was sending out mixed signals.The flags can be used as signals to other ships.

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.

B2 a series of electrical waves that are sent to a radio, television, or mobile phone


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.

a piece of equipment that tells trains to stop or to continue


a piece of equipment that shows people or vehicles when to stop, go, or move carefully:

a traffic signal

(Definition of “signal noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)