1. Reads news, commercials on radio or television.
2. Someone who proclaims a message publicly.

ETYM Latin annuntiator.
Indicates which electrical circuit has been active.
One that annunciates; specifically; a usually electrically controlled signal board or indicator.

1. Someone who talks (especially someone who delivers a public speech); SYN. talker.
2. The presiding officer of a deliberative assembly
Presiding officer in the us House of Representatives. The speaker is second in line of succession to the presidency in the event of death or incapacitation.