What does "admass" mean?

That part of society that is influenced by mass media advertising.

Admass

Common synonyms include: ad volume, add mass, advertising density, advertising load, advertising weight, augment mass.

noun

noun ·Rare ·Advanced level

Noun

1
That part of society that is influenced by mass media advertising. British, dated, uncountable
2
the segment of the public that is easily influenced by mass media (chiefly British) wordnet

From ad + mass, coined by British novelist J. B. Priestley.