Definitions for "kickoff"
A kick from the center of the field to start a football game or to resume it after a score.
Way to put the ball in play at the start of a game, after half-time, and after a goal. The ball is play from the center spot and must rotate one full turn before being touch by another player.
the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her"
Keywords:  begins, event, activity, time
the time at which an event or activity begins.