Audience duplication

The number of people who saw or heard more than one of the programs or publications in which an ad was placed.
Found on http://www.encyclo.co.uk/local/21023

Audience Duplication

The extent to which the audience of one station is exposed to that of another.
Found on http://www.superglossary.com/Glossary/Technology/Television_%28TV%29/
No exact match found