Origins
The prefix 'hyper-' enters English from Greek 'hypér' (ὑπέρ), a preposition and prefix meaning 'over,' 'above,' 'beyond,' or 'exceeding.' It descends from PIE *upér (over, above), making it the exact cognate of Latin 'super' — the two prefixes are the same word inherited through different branches of the Indo-European family. English possesses both, and their coexistence creates a productive doubling: 'supernatural' and 'hypernatural,' 'supersonic' and 'hypersonic,' 'superman' and 'hyperion' all draw on the same underlying concept of being 'over' or 'above.'
In Greek, 'hypér' was an extremely common preposition governing the genitive case (meaning 'on behalf of, for the sake of') and the accusative case (meaning 'over, above, beyond'). Homer used it in both senses throughout the Iliad and Odyssey. As a prefix, it appeared in numerous compounds: 'hyperboré' (beyond the north wind), 'hyperbállein' (to throw beyond), 'hyperékhein' (to hold above, to surpass).
The mythological Hyperion (Ὑπερίων, 'the one who goes above') was a Titan, father of Helios the sun god — his name describes the sun's daily passage over the sky. Keats's unfinished poem 'Hyperion' (1819) drew on this cosmic image, and the name has been recycled for satellites, spacecraft, and microprocessors, always carrying the sense of something that operates 'above.'
Latin Roots
'Hyperbole' (ὑπερβολή) is perhaps the oldest 'hyper-' word in English literary usage, borrowed from Greek through Latin in the fifteenth century. It means literally 'a throwing beyond' (hyper- + ballein, to throw) — rhetorical exaggeration that throws meaning beyond the literal truth. The mathematical term 'hyperbola' comes from the same Greek word, applied by Apollonius of Perga to a conic section that 'exceeds' or 'throws beyond' the base of the cone.
Medical and scientific terminology is where 'hyper-' does its heaviest work. In medicine, 'hyper-' systematically indicates excess, overabundance, or pathologically elevated levels, forming a precise opposition with 'hypo-' (under, below, deficient). This pairing creates a diagnostic vocabulary of extraordinary clarity: 'hypertension' (excessive blood pressure) versus 'hypotension' (insufficient blood pressure); 'hyperglycemia' (excessive blood sugar) versus 'hypoglycemia' (deficient blood sugar); 'hyperthyroidism' (overactive thyroid) versus 'hypothyroidism' (underactive thyroid); 'hyperthermia' (dangerously elevated body temperature) versus 'hypothermia' (dangerously low body temperature). This systematic Greek-derived nomenclature allows medical professionals worldwide to communicate precisely about conditions of excess and deficiency.
The twentieth century saw 'hyper-' move from technical into colloquial English. 'Hyperactive' emerged in the 1850s as a medical term but became widely known in the 1970s and 1980s when attention-deficit/hyperactivity disorder (ADHD) entered public awareness. The informal adjective 'hyper' — meaning restless, excited, overstimulated — was clipped from 'hyperactive' and became standard casual English by the 1970s.
Later History
The computing revolution generated a new wave of 'hyper-' coinages. Ted Nelson coined 'hypertext' in 1963 to describe text that goes 'beyond' ordinary linear text by containing links to other texts — a concept that became the foundation of the World Wide Web. 'Hyperlink,' 'hypermedia,' and 'hypervisor' followed, all using 'hyper-' in its sense of transcending ordinary limits.
'Hypersonic' (exceeding Mach 5, or five times the speed of sound) uses 'hyper-' to indicate a speed regime beyond supersonic — literally 'over-over-sound,' since 'supersonic' already means 'above sound.' This layering of Latin and Greek forms of the same PIE root (*upér) within a single semantic domain illustrates how English freely draws on both classical traditions simultaneously.
The distinction between 'hyper-' and 'super-' in modern English is primarily one of register and connotation rather than core meaning. 'Super-' tends toward the positive, colloquial, and amplifying ('superstar,' 'superhero,' 'super cool'). 'Hyper-' tends toward the clinical, excessive, and potentially pathological ('hyperactive,' 'hypertension,' 'hypersensitive'). Yet both prefixes mean exactly the same thing at their etymological core: 'over' and 'above.' The divergence in connotation is a product of how English has deployed each prefix over centuries, not of any original semantic difference.