curve
Americannoun
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a continuously bending line, without angles.
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the act or extent of curving.
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any curved outline, form, thing, or part.
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a curved section of a road, path, hallway, etc.
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Railroads. a curved section of track: in the U.S. the curve is often expressed as the central angle, measured in degrees, of a curved section of track subtended by a chord 100 feet (30 meters) long degree of curve.
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Baseball.
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the path followed by a ball pitched as a curveball.
The curve on that ball was nasty!
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a graphic representation of the variations effected in something by the influence of changing conditions; graph.
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Mathematics. a collection of points whose coordinates are continuous functions of a single independent variable.
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Education. a grading system based on the scale of performance, so that those performing better relative to others in the group, regardless of their actual knowledge of the subject, receive high grades.
The new English professor grades on a curve.
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a curved guide used in drafting.
verb (used with object)
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to bend in a curve; cause to take the course of a curve.
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to grade on a curve.
verb (used without object)
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to bend in a curve; take the course of a curve.
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Baseball. to pitch a curveball.
After two forkballs, Stewart curved to Hernandez for a called strike.
adjective
idioms
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throw (someone) a curve,
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to take (someone) by surprise, especially in a negative way.
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to mislead or deceive.
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flatten the curve. see flatten the curve.
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ahead of / behind the curve, at the forefront of (or lagging behind) recent developments, trends, etc.
noun
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a continuously bending line that has no straight parts
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something that curves or is curved, such as a bend in a road or the contour of a woman's body
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the act or extent of curving; curvature
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maths
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a system of points whose coordinates satisfy a given equation; a locus of points
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the graph of a function with one independent variable
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a line representing data, esp statistical data, on a graph
an unemployment curve
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ahead of the times; ahead of schedule
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behind the times; behind schedule
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short for French curve
verb
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A line or surface that bends in a smooth, continuous way without sharp angles.
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The graph of a function on a coordinate plane. In this technical sense, straight lines, circles, and waves are all curves.
Other Word Forms
Derived Forms
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curvednessnoun
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undercurvenoun
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undercurveverb (used without object)
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curvelessadjective
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curvyadjective
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uncurvedadjective
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uncurvingadjective
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well-curvedadjective
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curvedlyadverb
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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curvesimple
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curvessimple
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have curvedperfect
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has curvedperfect
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am curvingprogressive
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are curvingprogressive
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is curvingprogressive
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have been curvingperfect progressive
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has been curvingperfect progressive
Past
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curvedsimple
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had curvedperfect
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was curvingprogressive
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were curvingprogressive
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had been curvingperfect progressive
Future
Etymology
Origin of curve
First recorded in 1565–75; from Middle French or directly from Latin curvus “crooked, bent, curved”
Explanation
A curve is an arched or bent shape, like the curve of a smiling mouth or the curve of a road that twists and turns as you drive along the coast. As a noun, a curve can be any shape that deviates from being perfectly straight. You can trace a curve on a graph, throw an arcing pitch in baseball called a curve ball, or just admire the curves of the rolling hills in the distance. And as a verb, curve means to make or form this non-straight shape: "When she's happy, my dog's tail curves up over her back."
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
This World Cup has only been an upward curve.
From BBC • Jul. 12, 2026
“MTIA progress should improve the cost curve over time, particularly for inference and core recommendation workloads,” Black wrote in a Thursday note.
From MarketWatch • Jul. 9, 2026
Cold noodles need a dressing with enough substance to coat every curve and ridge, but enough brightness to keep the bowl from feeling stodgy after a few hours in the fridge.
From Salon • Jul. 8, 2026
Nizard also expects that the Treasury yield curve will start to steepen as markets potentially scale back expectations for higher interest rates from the Federal Reserve.
From The Wall Street Journal • Jul. 7, 2026
The curve of her chin and the way her nostrils flared a little as she smiled reminded him of something.
From "Boy 2.0" by Tracey Baptiste
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.