The quality or state of being audacious; boldness, daring, or reckless confidence.
From 'audacious' with the noun-forming suffix '-ness', which creates abstract nouns from adjectives. Ultimately from Latin 'audacia' (boldness).
English loves adding '-ness' to adjectives to make nouns—'happiness,' 'sadness,' 'audaciousness'—it's so flexible that we can turn almost any quality into a thing we can count and discuss!
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