交こう

noun

association; fellowship; intercourse

Used mainly in compounds or fixed expressions to indicate mutual relationship or social interaction. Not a standalone word in modern Japanese.

• 「交まじわり」や「交こう際さい」の交こうは、人ひとと人ひととのつながりを表あらわす。

  The 交 in 交わり or 交際 expresses a connection between people.

noun

change of season or year

Appears in classical or literary expressions like 春秋の交 (the turn of spring and autumn). Not used independently in modern speech.

• 「春しゅん秋じゅうの交こう」という表ひょう現げんで、季き節せつの変かわり目めを指さすことがある。

  The phrase 春秋の交 can refer to the change of seasons.