1 more -- 额外地；另外；外加
2 something that you can get with something else if you pay a little more money -- 另外付费即可额外得到的东西
3 a person in a film who does not have a speaking part and who is usually part of the scene, for example, in a crowd -- （电影中的）临时演员，群众演员
4 a point given to one cricket team if the other team makes an illegal mistake when bowling -- 额外得分（板球中一队在另一队发球犯规时所得的分数）
5 outside or in addition to -- 在…之外；超出；越出
extraterrestrial beings (= imaginary creatures which come from outside the planet Earth) 外星人
an extramarital affair (= a sexual relationship of a married person with someone other than their husband or wife) 婚外恋
extracurricular activities (= activities which are not part of the usual school or college course) 课外活动
Have you warned them that there will be an extra person for dinner?
Do you have to pay extra for installation?
It won't cost much extra, so we might just as well stay for another night.
They charge extra for any additional passengers.
