twinning

[ twin-ing ]
/ ˈtwɪn ɪŋ /

noun

the bearing of two children at one birth.
the coupling of two persons or things; union.
Crystallography. the union of crystals to form a twin.
an act or instance of matching or resembling someone or something in a specific way, and the acknowledgment of this resemblance (often used attributively): accidental twinning;I love those twinning outfits.Look at their twinning duckfaces.

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Origin of twinning

First recorded in 1565–75; twin1 + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for twinning

Medical definitions for twinning

twinning
[ twĭnĭng ]

n.

The bearing of twins.
A pairing or union of two similar or identical objects.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.