婚姻

1. Origins, structure, and basic meaning

• Structure: The legal noun 婚姻 (こんいん) denotes marriage as a legally or socially established spousal union.
• Basic usage: It can mark a cause in 婚姻によって氏が変わる and forms the compound 婚姻関係.

2. Common pitfalls and similar expressions

• Marriage in formal contexts
  • It is a formal term for a relationship established under law or formal rules rather than the wedding event itself.