signal Definition in Cambridge British English Dictionary
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Definition of "signal" - British English Dictionary

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signalnoun [C]

uk   us   /ˈsɪɡ.nəl/

signal noun [C] (ACTION)

B2 an action, movement, or sound that gives information, a message, a warning, or an order: When she gave (them) the signal, they all cheered. [+ that] The firework was a signal that the festival had started. [+ to infinitive] The police officer gave us a signal to stop. The signal for a race to start is often the firing of a gun. US (UK indicator) a turn signal
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signal noun [C] (WAVE)

B2 a series of electrical or radio waves that are sent to a radio or television in order to produce a sound, picture, or message
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signal noun [C] (SHOWING)

something that shows that something else exists or is likely to happen: The poor result is a clear signal of his deteriorating confidence. The changing colour of the leaves on the trees is a signal that it will soon be autumn.

signal noun [C] (EQUIPMENT)

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 signal

signalverb

uk   us   /ˈsɪɡ.nəl/ (-ll- or US usually -l-)

signal verb (ACTION)

C2 [I or T] to make a movement, sound, flash, etc. that gives information or tells people what to do: Flashing lights on a parked car usually signal a warning (to other motorists). He signalled left, and turned the lorry slowly. He was signalling (= giving a signal) with a red flag. She signalled for help. [+ that] She signalled to the cars behind that they were going the wrong way. [+ obj + to infinitive ] The children's mother signalled them to be quiet. [+ to infinitive] The children's mother signalled to/for them to be quiet.
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signal verb (SHOW)

[T] to show that you intend or are ready to do something: [+ that] The union has signalled that the workers will strike. The union has signalled the workers' intention to strike. The death of Chairman Mao signalled (= marked) the end of an era in Chinese history.

signaladjective [before noun]

uk   us   /ˈsɪɡ.nəl/ formal
noticeable and unusual: a signal success/failure
(Definition of signal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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