[BendtheBar]

For what it's worth, these are my personal standards for beginning, intermediate and advanced lifters.

Some beginners can hit progressional walls, and on paper be considered an intermediate, but in the gym they still need to work on form (or other things such as motivation, or fighting off the urge to tweak everything every week of the year). Outside of the gym they may need to work on diet. Etc.

Some intermediates may think they are advanced, when in fact they haven't hit true walls yet. They may have a horrible diet or poor training habits. These standards are based upon the assumption that the trainee is eating, resting and training properly.

Beginner: Smooth sailing with linear progression; weekly weight additions.
Intermediate: A lift becomes a grind, and adding weight each week isn't possible - but adding reps is.
Advanced: Adding reps becomes a grind, and isn't possible without a lot of program tweaking and testing. Even still, weight and reps come slow.

Simply stated:

Can add weight - Beginner.
Can add reps - Intermediate.
Grind - Advanced.