announcer

[uh-noun-ser]
noun
a person who announces, especially one who introduces programs, presents news items, reads advertisements, and does other similar assignments over radio or television.

Origin:
1605–15; 1920–25 in radio use; announce + -er1

preannouncer, noun
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World English Dictionary
announcer (əˈnaʊnsə)
 
n
a person who announces, esp one who reads the news, introduces programmes, etc, on radio or television

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

announcer
1640s, agent noun from announce (q.v.). Radio sense is recorded from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Every few minutes, an announcer breaks into regular programming.
Announcer: your clothes and give your new home a warm glow from a gas fireplace.
Each group member will either be the counter, the checker, or the announcer for his or her group.
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