[{"Bold_text": "noun", "List Items": ["Alsolet?ter box?.Chiefly British.a public or private mailbox.", "Digital Technology, Television.a technique for displaying a wide-screen film or landscape video on a narrower screen by reducing its size but retaining the aspect ratio aspect ratio,with black bands filling the screen above and below the picture (often used attributively):Compare pan and scan pan and scan, pillarbox(def1) pillarbox(def1).letterbox videos."]}, {"Bold_text": "verb (used with object)", "List Items": ["Digital Technology, Television.to display (a film or video) by using the letterbox technique."]}]