Dictionary/オープン戦オープンせんOopunsenオープン戦 (Oopunsen) is a Japanese noun meaning “exhibition game, preseason game”.Meaningsnounexhibition game; preseason gameKanji in オープン戦戦warRelated words戦うto make war (on)戦war作戦tactics戦争war戦地front (in battle)挑戦challenge戦場battlefield緒戦beginning of hostilities戦闘battle戦士soldier戦力war potential戦略strategy