(football) a kick from the center of the field to start a football game or to resume it after a score
"The referee blew the whistle and sent the ball soaring downfield for the kickoff."
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"
Alternative spelling of kick-off
"The team announced their new campaign kickoff next Monday."