回答：是permission。
意思：n. 同意，许可；许可证，书面许可
拓展：mit结尾的动词变名词，admit-admission，emit-emission,limit-limitation，commit-commiment。
例句
①They cannot leave the country without permission.
没有许可他们不得离开这个国家。
②He asked permission to leave the room.
他请求离开房间的许可。
③You are not to leave your station without permission.
未经允许，不得离开岗位。
