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The term 'aspect ratio' specifically refers to the relationship between the width and height of a display. It is expressed as a ratio, such as 16:9 or 4:3, which indicates how many units of width there are for every unit of height. This measurement is crucial for determining how an image or video will be displayed on different screens, ensuring that images are not stretched or compressed beyond their intended proportions. Understanding aspect ratio is important for content creators and technicians in the audiovisual industry, as it affects the overall viewing experience and image quality.

The other choices either describe different characteristics of a video display or are unrelated concepts. The distance of projection from the screen pertains to how the image is projected but does not define the shape of the image. The number of pixels in a video image indicates resolution but does not provide information about the image's dimensions. The frame rate refers to how many frames are shown per second in a video, which is separate from the dimensions of the display itself.