callback

noun

/ˈkɔːlbæk/

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[countable] a phone call that you make to somebody who has just called you回拨的电话；打回的电话Topics Phones, email and the internetc2
Callback™, ringback
[uncountable, countable] a phone service that you can use if you call somebody and their phone is being used, so that your phone will ring when the line is free; a call made using this service回调：如果您呼叫某人并且正在使用他们的电话，则可以使用的电话服务，以便在线路空闲时您的电话会响铃；使用此服务进行的通话
[uncountable, countable] (computing计算机) a process by which the user of a computer or phone system proves their identity by contacting a computer, which then contacts them回叫（指计算机或电话系统用户通过连接某台计算机证实自己的身份，然后该系统对之进行回调）
[countable] (especially North American English) an occasion when you are asked to return somewhere, for example for a second interview when you are trying to get a job（对求职者等的）召回

BNC: 0 COCA: 29585

callback