Search Result for "readership": 
Wordnet 3.0

NOUN (1)

1. the audience reached by written communications (books or magazines or newspapers etc.);


The Collaborative International Dictionary of English v.0.48:

Readership \Read"er*ship\, n. The office of reader. --Lyell. [1913 Webster]
WordNet (r) 3.0 (2006):

readership n 1: the audience reached by written communications (books or magazines or newspapers etc.)