messagewindow

noun
UK /ˈmɛsɪdʒ ˈwɪndəʊ/
US /ˈmɛsɪdʒ ˈwɪndoʊ/

A message window is a small box on a screen that shows words or news to you.

A message window popped up to tell me my game was saved.


OTHER MEANINGS

2. A small separate area on a computer screen where you type or read messages.

She typed her reply in the message window at the bottom of the chat.

3. A window in a building where people leave or pick up written notes.

He left a note for the manager at the message window near the entrance.

4. A pop-up box that warns you about something on a device.

A message window appeared saying the battery was low.