1) Format for some DVDs 2) Mail holder 3) Mail receptacle 4) Mail slot 5) Slot in a front door 6) TV screen format 7) Wide-screen viewing method
Found on
https://www.crosswordclues.com/clue/letterbox
Format used widely on laser disc and many DVDs to fit wide-aspect-ratio movies (1.85:1 and 2.35:1, for example) into a smaller frame, such as the 1.78:1 area of an anamorphic DVD or the 1.33:1 area of a laser disc or video tape. The image is shrunk to fit the screen, leaving blank space on the top and bottom. This process sacrifices some vertical d...
Found on
http://www.encyclo.co.uk/local/21058
A process by which a widescreen film is presented on video. The top and bottom of the video frame is
Found on
https://www.encyclo.co.uk/local/22375
No exact match found.
