WordNet (r) 3.0 (2006):

viewers
    n 1: the audience reached by television [syn: viewing
         audience, TV audience, viewers]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

VIEWERS. Persons appointed by the courts to see and examine certain matters,
and make a report of the facts together with their opinion to the court. In
practice they are usually appointed to lay out roads and the like. Vide
Experts.