con·​vex kän-ˈveks How to pronounce convex (audio) ˈkän-ˌveks How to pronounce convex (audio)
: curved or rounded outward like the exterior of a sphere or circle
: being a continuous function or part of a continuous function with the property that a line joining any two points on its graph lies on or above the graph
of a set of points : containing all points in a line joining any two constituent points
of a geometric figure : comprising a convex set when combined with its interior
a convex polygon

Examples of convex in a Sentence

Recent Examples on the Web Grimmer’s paper focused only on smooth functions, which have no sharp kinks, and convex functions, which are shaped like a bowl and only have one optimal value at the bottom. Quanta Magazine, 11 Aug. 2023 Fluted white marble columns sit on black granite pedestals, carrying the eye upward to where lines slide over, folds narrow, and concavities become convex. Justin Davidson, Curbed, 3 Aug. 2023 The new release swaps traditional convex lenses for a concave design, in an effort to reduce reflections by up to 70 percent. Kristy Alpert, Travel + Leisure, 9 July 2023 The festival grounds were strewed with funhouse-style concave/convex mirrors (so ticklishly distortive!), giant replica Minions and even a basketball court scaled down to backyard dimensions. M.t. Richards, Chicago Tribune, 24 June 2023 This is a thing — so much so that the Japanese have convex mirrors at the end of interior aisles to show oncoming traffic. Jacobina Martin, Washington Post, 8 June 2023 This is a thing -- so much so that the Japanese have convex mirrors at the end of interior aisles, to see oncoming traffic. Miss Manners | Judith Martin, Anchorage Daily News, 8 June 2023 All four screens are slightly convex with 3.9mm-resolution LED modules. Brad Townsend, Dallas News, 18 Apr. 2023 The shots, spanning nearly 40 years, include one of an elegant woman, face out of frame, slipping out of a pair of heels, and another depicting Hendricks’s reflection in a convex mirror, a twist on Parmigianino’s famous self-portrait. Caitie Kelly Julia Halperin Jinnie Lee Caitie Kelly Gisela Williams Mahira Rivers, New York Times, 6 Apr. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'convex.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Middle French or Latin; Middle French convexe, from Latin convexus vaulted, concave, convex, from com- + -vexus; perhaps akin to Latin vehere to carry — more at way

First Known Use

1571, in the meaning defined at sense 1a

Time Traveler
The first known use of convex was in 1571

Dictionary Entries Near convex

Cite this Entry

“Convex.” Dictionary, Merriam-Webster, Accessed 7 Dec. 2023.

Kids Definition


con·​vex kän-ˈveks How to pronounce convex (audio) kən- How to pronounce convex (audio)
: curved or rounded like the outside of a sphere or circle
a convex lens

Medical Definition


: curved or rounded like the exterior of a sphere or circle
convex lenses are used to correct for farsightedness
convexity noun
plural convexities
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