1. To make known through a proclamation, a speech, or an introduction: James, the butler, announced the names of the guests to the host at the royal ball.

The government is announcing or letting citizens know that there will be an increase in taxes.

2. To say something in a loud and definite way: When Sara received an "F" on her exam, she announced to her parents that she was quitting school.
3. When someone says that he or she is a candidate for a political office: The mayor, Mr. Smith, announced that he was going to run for governor.
4. To describe a sports event on the radio or television: Brian was expected to announce the basketball game on TV this evening.