What is the meaning of Viewer?

Someone who views a spectacle; an onlooker or spectator.

Someone who watches television.

Any optical device used to view photographic slides.

A program that displays the contents of a file.

An appointed inspector or examiner:

  1. The manager of a colliery, who directs its workings and ventilation.

The manager of a colliery, who directs its workings and ventilation.

alternative form of vewer

viewer; spectator

Source: wiktionary.org