1. a person who takes a lunch break or rest period around noon
Usage: informal; chiefly North American
2. a baseball game played in the early afternoon, typically starting around noon
Usage: informal; sports

Examples

• She's a nooner—she always takes her lunch break at exactly 12 o'clock.
• The team has a nooner tomorrow, so fans should arrive early.
• We caught the nooner at the ballpark instead of the evening game.
• As a nooner, he prefers to eat lunch and rest before returning to work.
• The nooner was rained out, so the game was rescheduled for the following week.