How to say "merger" in Japanese

Choosing the right word
  • 合併がっぺいJLPT N1approx.Common
    noun, suru verb, transitive verb, intransitive verbThe default for 'merger' in the business or administrative sense: companies merging, or towns and municipalities combining. When you say two firms merged, this is the word you want.
    2社しゃは合併がっぺいを計画けいかくしている。↗
    The two companies plan to unite.
  • 併合へいごうCommon
    noun, suru verb, transitive verb, intransitive verbA merger in the sense of joining into one or amalgamation. It is a formal word for things being united, but for company mergers 合併 is usually the word you want.
    その帝国ていこくはすべての小国しょうこくを併合へいごうした。↗
    The empire absorbed all the small states.
  • 混同こんどうJLPT N1approx.Common
    noun, suru verb, transitive verbHere 'merger' is marginal: 混同 really means confusion or mixing things up, especially mistaking one thing for another. It is seldom the word you want for a business or organizational merger.
    欲望よくぼうを愛あいと混同こんどうするな。↗
    Don't confuse desire with love.
  • 大同団結だいどうだんけつCommon
    noun, suru verb, intransitive verbA four-character idiom glossed as merger or presenting a united front. It refers to formerly divided groups uniting on a grand scale, and is figurative rather than a term for corporate transactions.
  • 合体がったいCommon
    noun, suru verb, transitive verb, intransitive verbCovers union, combination, coalescence or amalgamation — things physically or structurally combining into one. For company mergers 合併 is more idiomatic; 合体 suits combining bodies or machines.
    こういう風ふうに合体がったいすれば、14ポートのUSBハブになります。↗
    If you combine them in this way, you get a 14 port USB hub.

Use 合併 for the corporate or municipal sense; 併合 for joining into one; 合体 for physical combination; 混同 means confusion or mixing-up; 大同団結 is a yojijukugo for a united front.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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