I've always took it to mean this. Probably not done with only EQ boost though.
Sheen, Gloss and Air, to me, imply upper frequencies.
Warmth implies certain mids
etc.

It's kind of a basic definition, but these would be assumed by me when hearing the terms. Warmth also has to do with even VS odd harmonics in my eyes, but even these carry over to the other definitions.. even harmonics, while pleasant, mix in with the other even harmonics more .. again, this is all just my take on how I hear things.


Make your sound your own!
.. I do not work here, but the benefits are still awesome