Definition of "viewer"
noun:
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Someone that views some spectacle; an onlooker or spectator.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Someone who watches television.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Any optical device used to view photographic slides.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A program that displays the contents of a file of digital images; an image viewer or file viewer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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