Definition of message box in English:

message box

Syllabification: mes·sage box

noun

Computing
A small box that appears on a computer screen to inform the user of something, such as the occurrence of an error.
More example sentences
  • However, if the attached file is opened, a fake message box can appear berating the Windows operating system in a lengthy tirade.
  • Once the application has the result, it prints out a message to a message box to show if the login was successful.
  • Expect to get null pointer errors, every so often; an annoying message box appears, informing you of some mysterious internal null pointer error.

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