A close observer; someone who looks at something (such as an exhibition of some kind). Synonyms:looker, spectator, watcher, witness."Television viewers" , "Sky watchers discovered a new star"
2.
An optical device for viewing photographic transparencies.
... just what dreams to use in order to break him? Or did he himself furnish the actors and the action, projecting old terrors in this mist as a tri-dee tape projected a story in three dimensions for the amusement of the viewer? ... — Storm Over Warlock • Andre Norton
... an on-line display that is not immediately useful, but contributes to a viewer's gestalt of what's going on with the software or hardware behind it. Whether a given piece of info falls in this category depends partly on what the user is looking for at any given time. The 'bytes free' information at the ... — The Jargon File, Version 4.0.0
... should be further said, were ruled by a certain expression which, as the viewer chose, might with equal correctness have been called the effect of intelligence, love, pity, or sorrow; though, in better speech, it was a blending of them all—a look easy to fancy as the mark of a sinless soul doomed to the sight and understanding of the utter sinfulness of those among ... — Ben-Hur: A Tale of the Christ • Lew Wallace