From Longman Business Dictionary
dialogue boxˈdialogue ˌbox British EnglishBrE, dialog box American EnglishAmE noun [countableC] 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.