1. An individual who makes information known through a formal or an informal means: The Town Crier was an early form of a public announcer, calling out information about specific and timely events for citizens while he was walking the streets of a community.
2. A person who provides news on a television or radio station: Ingrid works part-time as an announcer for the local broadcasting company.
3. Anyone who gives messages in a public place; such as, an airport, a store, etc.; especially by using a loudspeaker: The airport announcer was letting people know that the next flight would be delayed because of the severe weather conditions.