1. to make a public or formal statement about something
2. to introduce someone or something, especially on radio or television
3. to give information about arrivals, departures, or other events over a loudspeaker

Examples

• The principal announces the winners of the science fair.
• She announces her engagement to her family.
• The radio host announces the next song.
• The airline announces boarding for flight 205.
• He announces his retirement from professional sports.
• The teacher announces tomorrow’s test to the class.
• The company announces record profits this quarter.