一戦|いっせんissen[0]heiban (flat)

1. noun, suru verb, intransitive verbbattle; game; bout

• Synonym交戦こうせんWrittenWritten, formal word for armies engaging each other; stresses the two sides opening hostilities. 「一戦」 simply counts one battle or one game.
• SynonymバトルCasualColloquial loanword for a battle or face-off, frequent in games and variety shows; 「一戦」 neutrally counts a single fight or match.
• Related試合しあいNeutralThe most common word for sports and board-game matches; it carries no combat nuance, which 「一戦」 can have.
• Related勝負しょうぶNeutralCenters on settling a win or loss, as in 「勝負をつける」; 「一戦」 just counts one bout without that focus.
• RelatedマッチNeutralMeans only a match for lighting fires and has no link to 「一戦」. The contest sense is written in katakana as 「マッチ」, never as 「燐寸」.
• Antonym休戦きゅうせんWrittenWritten word for a ceasefire or truce; it is the opposite of 「一戦」, which marks taking up a fight.
• Antonym和平わへいNeutralPeace, the state after war ends; it stands opposite the battle sense of 「一戦」.

For one battle or game say 「一戦を交える」 or 「大事な一戦」. Sports matches take 「試合」, deciding the winner 「勝負」, and casual talk 「バトル」; the opposite is 「休戦」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 一度いちどたたかうこと。一回いちかいの戦闘せんとう。
2. 一回いちかいの試合しあいや対局たいきょく。
3. 一回いちかいの性交せいこう。