English to English

noun (n)

• a close observer; someone who looks at something (such as an exhibition of some kind)(noun.person)

  Example:
  Television viewers.
  

  Synonym:
  looker, spectator, watcher, witness
  

  source: wordnet30
• an optical device for viewing photographic transparencies(noun.artifact)

  source: wordnet30
• One who views or examines.(noun)

  source: webster1913