Applied to premium gasoline. / (humorous, by extension) Of coffee: not decaffeinated. / Of a high standard.

simple past tense and past participle of high-heel

Upper-class. / Recognized for its quality.

Having a pretentious, high-class attitude

Possessing great physical or political power. / Vigorous and energetic. / (of an optical instrument) Capable of great magnification.

Of high quality, particularly good.

A junior high school.

expensive

Operating at relatively high pressure, such as several times atmospheric pressure. / Tense; stressful. / Involving much persuasion.

Having an elevated or moralistic tone; pompous. / Oratorial, sometimes to the point of sounding contrived.