readerbase means the established group of readers for a particular publication, etc.
Etymology
From reader + base.
noun
- The established group of readers for a particular publication, etc.“With such adornments as 2500 publications, about 50 million books sold over the year and about the same number of readerbase, it is a matter of no surprise that BPB titles are perscribed^([sic]) as standard courseware at most of the leading schools, institutes and universities in India.”