annunciator

1. Anything that announces something.

2. Anything that announces something.

   An officer in the church of Constantinople, whose business it was to inform the people of the festivals to be celebrated.

3. A signalling device that shows which of several electrical circuits is active, especially such a device in a telephone switchboard.

   an indicator that announces which electrical circuit has been active (as on a telephone switchboard)

4. (Британія)A buzzer in a signal box that sounds when a train activates a treadle positioned on the track, and thus provides a warning or announcement of a nearby train.

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