twinning

noun twin·ning \ ˈtwi-niŋ \

Definition of twinning

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
  • The 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.
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
  • The rhapsodizing literature and the inherent twinning of Disney's theme parks and its new town drew people with unrealistic dreams.
  • —Douglas Frantz et al.
3 : the assemblage of two or more crystals or parts of crystals such that they form a twin (see 1twin 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
  • The 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

First Known Use of twinning

1573

in the meaning defined at sense 1

See Words from the same year
NEW! Time Traveler

Medical Dictionary

twinning

noun twin·ning \ ˈtwin-iŋ \

medical Definition of twinning

: the bearing of twins

Learn More about twinning


Seen and Heard

What made you want to look up twinning? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

resembling the blue of the sky

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet-pasta-spelling-help
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!