![]() ![]() The Latin noun is inflexiō (inflectional stem inflexiōn-) “bending, curving,” a derivative of the verb inflectere “to bend, curve inward.” Inflection is the usual American spelling, inflexion the usual British one. ![]() The second meaning of inflection point, “a critical point at which a major or decisive change takes place,” dates from about 2006 and appears to be the coinage of Andrew Grove (1936–2016), a Hungarian-born American businessman, engineer, and author, and a pioneer in the semiconductor industry ( Time magazine named him Man of the Year in 1997). Inflection point, also point of inflection and flex point, originally, in the first half of the 18th century, was and still is today, was a mathematical term used in geometry and calculus, meaning “a point on a curve at which the curvature changes from convex to concave or vice versa.” This mathematical term gradually spread to other disciplines, such as engineering and economics, that use mathematics extensively.
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