1
: the act of producing or giving birth to twins
Rates of fraternal twinning vary from population to population, and the tendency to produce fraternal twins is genetically transmitted through the mother's line.—
Jane E. Brody
Jane E. BrodyThe frequency of twinning among women who have already borne twins, the 'repeat frequency,' is significantly higher than in the general population.—P. Parisi et al.
P. Parisi et al.2
: the coupling, association, or comparison of two similar people, groups, or things
It also encourages twinning between rich and poor parishes.—Thomas J. Reese
Thomas J. ReeseThe rhapsodizing literature and the inherent twinning of Disney's theme parks and its new town drew people with unrealistic dreams.—Douglas Frantz et al.
Douglas Frantz et al.3
: the assemblage of two or more crystals or parts of crystals such that they form a twin (see twin entry 1 sense 3)
One of them, a spiral defect, typically occurs when atoms crystallize from a high-temperature vapor. In the other defect, known as twinning, atomic lattices that are mirror images of each other join at a common boundary.—R. Cowen
R. CowenThe two-time Nobel laureate Linus Pauling, for example, championed an arrangement of ordinary crystals called twinning. Twinned crystals grow from separate origins and penetrate each other at odd angles, such as 72 degrees. This might produce a diffraction pattern with spurious fivefold symmetry, even though the underlying structure was conventional.—Hans C. Von Baeyer
Hans C. Von BaeyerExamples of twinning in a Sentence
Recent Examples on the Web
Digital twinning is soon to be a best practice in industries from defense to transportation and medical equipment manufacturing.
—John Werner, Forbes.com, 28 May 2025
Despite the commotion their accidental twinning caused online, Roach — who was filmed cooly reacting to seeing Sawai on the carpet — confirms that the vibes are all good not only between the two stars, but also between himself and Sawai's stylist.
—Michelle Lee, People.com, 14 May 2025
Nvidia and Cadence are also expanding their partnerships on digital twinning of datacenters with the Cadence Reality platform.
—Anshel Sag, Forbes.com, 21 Apr. 2025
As more companies look for ways to scale leadership without long-term commitments, fractional leadership—or fractional twinning—is likely to expand across multiple industries.
—Dr. Diane Hamilton, Forbes, 23 Feb. 2025
Tapestry is working with Adobe to gain ground on a fast-emerging trend in design and product development — digital twinning.
—David Moin, WWD, 15 Jan. 2025
On one hand, Cordero’s twinning of mountaineering and filmmaking reveals spiritual similarities to both endeavors.
—Siddhant Adlakha, Variety, 25 Dec. 2024
Longtime pals Matt Damon and Ben Affleck are both sporting beards, and apparently there's a special reason for the unexpected twinning.
—Lauren Huff, EW.com, 5 Nov. 2024
The mother of one recently shared an image of herself and her baby boy halo chilling in the gym and twinning, rocking matching bandanas.
—Elizabeth Ayoola, Essence, 26 Sep. 2024
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John Werner, Forbes.com, 28 May 2025
Despite the commotion their accidental twinning caused online, Roach — who was filmed cooly reacting to seeing Sawai on the carpet — confirms that the vibes are all good not only between the two stars, but also between himself and Sawai's stylist.
—Michelle Lee, People.com, 14 May 2025
Nvidia and Cadence are also expanding their partnerships on digital twinning of datacenters with the Cadence Reality platform.
—Anshel Sag, Forbes.com, 21 Apr. 2025
As more companies look for ways to scale leadership without long-term commitments, fractional leadership—or fractional twinning—is likely to expand across multiple industries.
—Dr. Diane Hamilton, Forbes, 23 Feb. 2025
Tapestry is working with Adobe to gain ground on a fast-emerging trend in design and product development — digital twinning.
—David Moin, WWD, 15 Jan. 2025
On one hand, Cordero’s twinning of mountaineering and filmmaking reveals spiritual similarities to both endeavors.
—Siddhant Adlakha, Variety, 25 Dec. 2024
Longtime pals Matt Damon and Ben Affleck are both sporting beards, and apparently there's a special reason for the unexpected twinning.
—Lauren Huff, EW.com, 5 Nov. 2024
The mother of one recently shared an image of herself and her baby boy halo chilling in the gym and twinning, rocking matching bandanas.
—Elizabeth Ayoola, Essence, 26 Sep. 2024
Cite this Entry
“Twinning.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/twinning. Accessed 5 Jul. 2025.
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