前線|ぜんせんzensen[0]heiban (flat)

1. noun, meteorology(weather) front
2. noun, militaryfront line; the front; battlefront; forward area
   彼かれらは兵士へいしとして前線ぜんせんに行いった。↗

   As soldiers they went to the front.

• Synonym最前線さいぜんせんNeutralThe very front line, as in 「医療の最前線」; stresses the foremost point more than 「前線」 and is often used figuratively.
• Synonym戦地せんちWrittenWritten/formal prose; the land where fighting takes place, as in 「戦地に赴く」. Leans toward the war area and never means a weather front.
• Antonym後方こうほうNeutralThe rear, standing opposite to 「前線」, as in 「後方支援」.

Use 「前線」 for a battle front or a weather front, as in 「梅雨前線」「桜前線」「前線に立つ」. Say 「最前線」 for the very forefront, 「戦地」 for the war zone, and 「後方」 for the opposite, the rear.

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

1. 敵陣てきじんに最もっとも近ちかく、直接ちょくせつ交戦こうせんする所ところ。
2. 前線面ぜんせんめんが地表ちひょうと交まじわる線せん。