The quality or state of being ambidextrous; the characteristic of being able to use both hands or handle situations with equal skill.
From ambidextrous + -ness, where -ness is added to an adjective to create an abstract noun. This formation dates to Old English and remains productive.
The -ness suffix is so common that we barely notice it, but it's actually a remarkable feature of English that lets us instantly convert almost any adjective into a noun describing that quality—try it with any adjective and it usually works!
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