1. devices that give audible or visual signals to announce or indicate something
Usage: technical
2. people who announce or proclaim something
Usage: formal

Examples

• The fire annunciators throughout the building sounded simultaneously.
• Security annunciators displayed which doors had been breached.
• The elevator annunciators chimed to indicate which floor had been reached.
• Emergency annunciators flashed red lights in the control room.
• The annunciators of the new policy faced strong opposition.
• Historical annunciators often used bells and horns to spread news.