notification
noun [ C or U ] uk/ˌnəʊ.tɪ.fɪˈkeɪ.ʃən/ us/ˌnoʊ.t̬ə.fəˈkeɪ.ʃən/
通知（书）;通告;告示
the act of telling someone officially about something, or a document that does this
You must give the bank (a) written notification if you wish to close your account. 如果你想撤消账户，必须向银行出具一份书面通知。
（提醒社交媒体账号上有更新的）通知信息
a message that is automatically sent to you to tell you there has been activity on one of your social media accounts, for example, when someone has commented on something you have written on Facebook™