applicationwindow

noun
UK /ˌæplɪˈkeɪʃən ˈwɪndəʊ/
US /ˌæplɪˈkeɪʃən ˈwɪndoʊ/

A box on a computer screen where you use a program.

Click the X to close the application window.


OTHER MEANINGS

2. The main frame of a software program that holds its menus and tools.

The application window has a menu bar at the top.

3. A separate viewing area opened by an app for a document or task.

She opened a new application window to compare two files.

4. The visible boundary of a running program on a graphical display.

Drag the application window to the other monitor.