sine
noun
\ ˈsīn
\
\
Definition of sine
1
: the trigonometric function that for an acute angle is the ratio between the leg opposite the angle when it is considered part of a right triangle and the hypotenuse
2
: a trigonometric function sin θ that for all real numbers θ is exactly equal to the sine of an angle of measure θ in radians and that is given by the sum of the alternating series {latex}\sin \theta = \theta - \frac{\theta^{3}}{3!} + \frac{\theta^{5}}{5!} - \frac{\theta^{7}}{7!} + \frac{\theta^{9}}{9!} - \dots{/latex}
Examples of sine in a Sentence
Recent Examples on the Web
The actors have been dating sine 2018 and share daughter Hayden Alan, now 2 years old. — Christina Dugan, PEOPLE.com, "Camilla Luddington's Original Wedding Venue Burned Down in California Fires: 'I Cried in My Car'," 23 Aug. 2019 The bigger this angle, the bigger the sine, and therefore the stronger their mutual influence. — Natalie Wolchover, WIRED, "The Math of How Crickets, Starlings, and Neurons Sync Up," 7 Apr. 2019 When a pair of arrows are coupled, the strength of their mutual influence depends on the sine of the angle between their pointing directions. — Natalie Wolchover, WIRED, "The Math of How Crickets, Starlings, and Neurons Sync Up," 7 Apr. 2019 Deerfield has been competing sine 2002 with numerous trophies across its six schools. — Steve Sadin, chicagotribune.com, "Walden School students awarded for cautionary tale about screen time," 10 June 2019 The Seagram Building, New York, NY, 1958 Johnson was the co-architect, with Mies, of the sine-qua-non of modern office towers, and his contribution is routinely undervalued. — Mark Lamster, Curbed, "Arbiter of taste, enfant terrible: The best and worst of Philip Johnson," 6 Nov. 2018 His sine law allows anyone with a decent grounding in trigonometry to use a pendulum to determine their latitude. — Alicia Ault, Smithsonian, "How Does Foucault’s Pendulum Prove the Earth Rotates?," 3 Feb. 2018These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for sine
sine
noun
English Language Learners Definition of sine
geometry
: the ratio between the long side (called the hypotenuse) and the side that is opposite to an acute angle in a right triangle
See the full definition for sine in the English Language Learners Dictionary