1. A kick from the center of the field to start a football game or to resume it after a score.
2. A start given to contestants; SYN. send-off, start-off.

1. The act of setting in operation; start up
2. When you start up something, or something starts up, this action is a start-up. When you start up something, you use the start-up switch, button, and soon.
3. A start-up or start-up business or company is a new business or company.

See boot.