内乱|ないらんnairan[0]heiban (flat)

1. nouncivil war; insurrection; rebellion; domestic conflict
   イングランドはかつて内乱ないらんで分裂ぶんれつしたことがあった。↗

   England was once torn by civil war.

• Synonym内戦ないせんNeutralWar between factions within one country. 「内乱」 stresses domestic rebellion and unrest, but both words can describe large-scale internal conflict.
• Related市民戦争しみんせんそうWrittenA written-style term for civil war between citizens; it reads like a translation and is rarely used. 「内乱」 stresses domestic rebellion and unrest.
• Antonym太平たいへいWrittenA written word for a world at peace, as in 「天下泰平」; it stands in contrast to internal upheaval.
• Antonym平和へいわNeutralPeace and stability; the direct opposite of 「内乱」.

Use 「内乱」 for domestic rebellion and unrest, as in 「内乱罪」. For war between factions within a country, 「内戦」 is the usual word; 「市民戦争」 is rare. For the opposite, 「太平」 is a written word for a world at peace, 「平和」 the everyday word for peace.

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

1. 国内こくないで政治的せいじてきな対立たいりつなどにより起おこる騒乱そうらん。