time signal
US /ˈtaɪm ˌsɪɡ.nəl/
UK /ˈtaɪm ˌsɪɡ.nəl/
1.
an audible signal indicating the exact time, typically broadcast on radio or television
:
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The radio station broadcasts a time signal every hour on the hour.
•
My watch is set to the atomic time signal for accuracy.