요인factor; cause 원인cause; reason 패인cause of defeat; cause of failure 동인motive 변인variable 사인cause of death 인과cause and effect 인과응보karma; poetic justice; retributive justice 인습convention; old custom 인습적being conventional

연분tie; connection; relationship 학연old boy network; school ties 혈연blood relation; blood ties 혈연관계blood relation; blood ties 결연forming a relationship; relationship; ties 내연common law marriage; informal marriage 사연story; circumstances 악연ill-fated relationship; evil destiny 연tie; connection; relationship 연고cause; reason