a situation in which you have a close friendship or sexual relationship with someone

Intimacy between teachers and students is not recommended. 不提倡师生之间关系过于密切。

things that are said or done only by people who have a close relationship with each other

It was obvious from their witty intimacies that they had been good friends for many years. 从他们风趣的亲昵言行很容易看出，他们已是多年的好友。