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signal

noun [C] (ACTION)
 
 
/ˈsɪɡ.nəl/

Definition

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.Signs, signals and symbolsSpecific signs and symbols US for indicatorThe exterior of vehicles
(Definition of signal noun (ACTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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