Princeton's WordNet

1. spectator, witness, viewer, watcher, looker(noun)

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

   "the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star"

2. viewer(noun)

   an optical device for viewing photographic transparencies

Kernerman English Learner's Dictionary

1. viewer(noun)ˈvyu ər

   sb who watches a particular TV show

   Viewers can vote on the contestant they like best.

Wiktionary

1. viewer(Noun)

   Someone that views some spectacle; an onlooker or spectator

2. viewer(Noun)

   Someone who watches television

3. viewer(Noun)

   Any optical device used to view photographic slides

4. viewer(Noun)

   A program that displays the contents of a file of digital images; an image viewer or file viewer

Webster Dictionary

1. Viewer(noun)

   one who views or examines

2. Viewer(noun)

   a person appointed to inspect highways, fences, or the like, and to report upon the same

3. Viewer(noun)

   the superintendent of a coal mine

• kykerAfrikaans
• مُشاهِدArabic
• зрителBulgarian
• espectadorPortuguese (BR)
• divákCzech
• der/die Fernsehzuschauer(in)German
• seerDanish
• θεατήςGreek
• espectadorSpanish
• televaatajaEstonian
• بینندهFarsi
• katselijaFinnish
• téléspectateur/-triceFrench
• צוֹפֶהHebrew
• दर्शक, प्रेक्षकHindi
• gledateljCroatian
• nézőHungarian
• pemirsaIndonesian
• (sjónvarps)áhorfandiIcelandic
• telespettatore, telespettatriceItalian
• 視聴者Japanese
• 텔레비전 시청자Korean
• žiūrovasLithuanian
• skatītājsLatvian
• penontonMalay
• kijkerDutch
• (fjernsyns)seerNorwegian
• telewidzPolish
• espectadorPortuguese
• telespectatorRomanian
• телезрительRussian
• divákSlovak
• gledalecSlovenian
• gledalacSerbian
• tv-tittareSwedish
• ผู้ดูThai
• televizyon izleyicisiTurkish
• 電視觀眾Chinese (Trad.)
• глядачUkrainian
• ٹيلي ويژن ديکھنے والا، ناظرUrdu
• người xemVietnamese
• 电视观众Chinese (Simp.)