noun
exhibition game; friendly match
General sports term for a match played for practice or goodwill, not part of a regular competition.
シーズン前に、いくつかの交流戦が予定されている。
Several exhibition games are scheduled before the season.
noun
interleague game (Central vs. Pacific League)
Specifically refers to regular-season interleague play between Nippon Professional Baseball's Central and Pacific Leagues.
今年の交流戦では、セ・リーグが勝ち越した。
The Central League had a winning record in this year's interleague games.
親善試合 emphasizes goodwill between nations or groups; 交流戦 is broader and commonly used in baseball.
Compound of 交流 (exchange, interchange) and 戦 (match, game). The specific NPB interleague sense developed from the idea of teams from different leagues exchanging play.