交際

1. Origins, structure, and basic meaning

• Structure: 交際 (こうさい) is a noun that also forms a する verb for a relationship or social interaction with other people.
• Basic usage: It describes a couple's long relationship or wider interaction with people from other regions through work.
  • 二人は長い交際を経て結婚を決めた。 — After a long relationship, the couple decided to marry.
  • 仕事を通じて他の地域の人々との交際が広がった。 — Work expanded my interactions with people from other regions.

2. Common pitfalls and similar expressions

• Relationship and social interaction
  • 二人の交際 can describe a relationship between two people, while 人々との交際 describes social interaction with a wider group. The other party can be linked with との.