From Longman Dictionary of Contemporary Englishdialogue boxˈdialogue ˌbox British English, dialog box American English noun [countable] a box that appears on your computer screen when the program you are using needs to ask you a question before it can continue to do something. You click on one part of the box to give your answer.
Examples from the Corpus
dialogue box• This brings up a dialogue box, where you type in the necessary alterations.• A dialogue box will appear asking you whether you want a new Program Group or a new Program Item.• Whenever a file is opened or saved a number of extra buttons appear in the dialogue box.• The standard file is accessed by many applications to provide the dialogue box which allows files to be opened and saved.• This dialogue box will search for data within set criteria, extract it and write it to a pre-defined output block.From Longman Business Dictionarydialogue boxˈdialogue ˌbox British English, dialog box American English noun [countable] COMPUTING a box that appears on your computer screen when particular programs are running, which asks you a question before it continues to do something. You click on one part of the box to give your answerSelect ‘Display’ and a dialogue box will appear with a choice of screen display options. 