noun
a system used to make announcements or address a large group of people in a public setting
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The public address system in the auditorium ensures that everyone can hear the announcements clearly.
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Hey, can you hear me through the public address system or should I shout louder?
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I love it when they crank up the tunes on the public address system during lunch break.
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Her voice echoed through the room like a public address system, commanding everyone's attention.