[U] polite behaviour and respect for other people

有礼的举止，礼貌;

It's a matter of common courtesy to acknowledge letters.

确认收到来信是起码的礼貌。

He didn't even have the courtesy to call and say he couldn't come.

他甚至连打个电话来说一声他不能来的礼貌都没有。

[C] something you do or say to be polite

礼貌的行为（言语）:

The two men exchanged courtesies before getting down to business.

这两个人寒暄了几句后才开始谈正事。

(by) courtesy of sb, by someone's permission or kindness, rather than by paying them

承蒙某人的允许; 由于某人的好意〔而不是由于付了钱〕:

photographs supplied courtesy of Blenheim Palace

承蒙布伦海姆宫提供的照片

(by) courtesy of sth, if one thing happens courtesy of another, the second thing caused the first

由某事引起，因某事造成:

Healy received a deep cut on his left hand, courtesy of Nicol's ice skate.

希利左手被划出了一道深深的伤口，是尼科尔的冰鞋造成的。

do sb the courtesy of doing sth, to be polite enough to do something for someone

为对某人表示礼貌而做某事:

At least do me the courtesy of telling the truth.

至少请你告诉我实话。

provided free to a customer by a company

〔公司〕免费提供的:

The hotel runs a courtesy bus from the airport.

这家酒店有免费巴士从机场开出。

Most reviewers receive a courtesy copy of the book.

大多数书评家都收到了一本赠书。

courtesy visit / call, a visit etc done to be polite or show respect

礼节性访问:

Our captain put in a courtesy visit during dinner.

我们的队长在宴会中作了礼节性拜访。