—adj. 1. overexcited; overstimulated; keyed up.
2. seriously or obsessively concerned; fanatical; rabid: She's hyper about noise pollution. 3. hyperactive.
—n. a person who is hyper.
Pronunciation: (hī'pur),[key] —n.Informal. a person who promotes or publicizes events, people, etc., esp. one who uses flamboyant or questionable methods; promoter; publicist.
a prefix appearing in loanwords from Greek, where it meant “over,” usually implying excess or exaggeration (hyperbole); on this model used, especially as opposed to hypo-, in the formation of compound words (hyperthyroid). Cf. super-.