How to say "coupling" in Japanese

• 結合けつごうJLPT N1approx.Common
  noun, suru verb, transitive verb, intransitive verbCovers 'coupling' in the sense of combination, union, or joining, where the parts come together as one. Typical for physical, chemical, or technical contexts in which elements are bonded or integrated.
  これらの州しゅうは結合けつごうして１つの国くにになった。↗

  These states were united into one nation.
• 連結れんけつCommon
  noun, suru verb, transitive verbCovers 'coupling' in the sense of linking or connecting separate things together, such as cars in a train. The nuance is that linked units stay distinct rather than merging into a single whole.
  ここでも、このアプローチがマシュー・アーノルドの「どこにも連結れんけつがある」という考かんがえに由来ゆらいしていることを見みて取とることができる。↗

  Again, we can see this approach as deriving from Matthew Arnold's idea that everywhere there is connection.

Both words translate 'coupling' as joining or linking; 結合 emphasizes a union or combination of things into one, while 連結 emphasizes connecting separate units while they remain distinct.

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

• 結合けつごうcombination
• 連結れんけつconnection
• カップリングcoupling
• 相引そういんcoupling
• 継手つぎてcoupler