παράδειγμα

The Greek noun parádeigma comes from the verb paradeíknynai, built from para- (beside, alongside) and deíknynai (to show, to point out, to display). A parádeigma was something shown alongside something else for comparison or illustration — an exemplar, a model, a pattern. In Platonic philosophy the term took on metaphysical weight: the Forms or Ideas (eídē) were the paradigms of physical things, the perfect archetypes beside which imperfect material objects were pale comparisons. A beautiful horse was a beautiful horse because it participated in the Paradigm of Horse, the ideal form that all horses imperfectly instantiated. This Platonic usage gave paradigm a philosophical resonance far beyond its humble rhetorical origins.

In classical rhetoric and grammar, parádeigma referred to an example used in argument — roughly what we call a precedent or case study. The grammarians also used it for the paradigm of a verb or noun: the table showing all its conjugated or declined forms laid out side by side so students could see the pattern. This grammatical usage persisted through medieval and Renaissance Latin scholarship, and it is the grammatical sense — a pattern, a template, an exemplary set — that most directly feeds into modern English.

The word's modern philosophical career was transformed by Thomas Kuhn's 1962 work The Structure of Scientific Revolutions, where Kuhn used 'paradigm' to mean the constellation of shared assumptions, methods, and exemplars that define what normal science looks like within a field. A 'paradigm shift' occurs when anomalies accumulate to the point where the entire framework is overturned — as Newtonian mechanics was overturned by relativity. Kuhn's usage was imprecise enough (he used paradigm in at least 21 different senses in the first edition) that it immediately escaped philosophy of science and colonized every field of intellectual life, making 'paradigm shift' perhaps the most overused phrase in academic and corporate language alike.