If someone who has authority over you gives you permission to do something, they say that they will allow you to do it.
例句
He asked permission to leave the room...他請(qǐng)求準(zhǔn)許離開房間。Finally his mother relented and gave permission for her youngest son to marry...最后他母親讓步了,準(zhǔn)許她的小兒子結(jié)婚。
N-COUNT
許可證；書面許可
A permission is a formal, written statement from an official group or place allowing you to do something.