Advanced in complexity or elaboration.

Roget 33: superior, greater, major, higher; exceeding etc. v.; great etc. 31; distinguished, ultra [Lat.]; vaulting; more than a match for.    supreme, greatest, utmost, paramount, preeminent, foremost, crowning; first-rate etc. (important) 642, (excellent) 648; unrivaled peerless, matchless; none such, second to none, sans pareil [Fr.]; unparagoned^†, unparalleled, unequalled, unapproached^†, unsurpassed; superlative, inimitable facile princeps [Lat.], incomparable, sovereign, without parallel, nulli secundus [Lat.], ne plus ultra [Lat.]; beyond compare, beyond comparison; culminating etc. (topmost) 210; transcendent, transcendental; plus royaliste que le Roi [Fr.], more catholic than the Pope increased etc. (added to) 35; enlarged etc. (expanded) 194.    ... meer laten zien

Of education beyond the secondary level.