Definition of "widescreen"

(often attributive) A screen with a wider aspect ratio than the ordinary 35-millimeter frame, making more effective use of the human field of view and producing a more immersive view experience.  examples

(film) Filmed in a greater aspect ratio than the 1.33:1 or 1.37:1 aspect ratio.  examples

(of a motion picture) Presented in the original aspect ratio; presented in letterbox orientation.  examples