September Vogue weighs in with 734 pages of heavy print, Bazaar with 488.
What does "heavy print" mean?
Old habits die hard. Respondents ages 65 and over were almost three times more likely than the average respondent to be heavy print newspaper readers.
The use of different media has changed dramatically over time. It is a cliché that reading is in decline. But on the other hand we get considerable information from the Internet, which is a heavy print medium.
Google and Wikipedia searches return nothing concrete.
I found a similar question asked here, but not really of use to finding the definition.