Leadoff (adjective)

1. Relating to or serving as the opening or first performance or action in a series or sequence.
2. Relating to or serving as the starting point or opening event.

Origin:

From lead, meaning to go first or to be first, and off, meaning to begin.

Examples:

1. The leadoff hitter set the tone for the rest of the game with their strong performance.
2. The leadoff runner set a new record for the fastest time in the race.
3. The leadoff track on the album was the band's biggest hit to date.
4. The leadoff lecture in the series provided an overview of the topic.
5. The leadoff performer received a standing ovation for their exceptional talent.