A sporting event held at night under lights, especially a baseball night game.
今夜は球場でナイターがあるから、仕事の後に行こう。
There's a night game at the stadium tonight, so let's go after work.
夏休みはナイターで花火大会と一緒に楽しめる日もあります。
During summer vacation there are nights when you can enjoy a night game together with fireworks festivals.
台風でナイターの試合が翌日に順延になった。
The night game was postponed to the next day because of the typhoon.