The following is stated in the book:
" Materials with a greater permittivity allow for more field flux (offer less opposition), and thus a greater collected charge, for any given amount of field force (applied voltage)."
"Glass, for instance, with a relative permittivity of 7, has seven times the permittivity of a pure vacuum, and consequently will allow for the establishment of an electric field flux seven times stronger than that of a vacuum, all other factors being equal."

However, I learned from other sources, that "permittivity" is a misnomer. the higher the permittivty the higher the resistance to the build up of electric field flux and not the opposite.

Could someone please advise?

 

In my textbook, relative permittivity (dielectric constant) is the ability to establish an electric field. The higher the dielectric constant, the easier it is to establish an electric field and the higher the capacitance of a capacitor. Air(vacuum) has a dielectric of 1, glass 7.5, and ceramic 1200.