The quality or state of being devoted; the degree of dedication, loyalty, and commitment someone shows.
From 'devoted' (adjective) + -ness (suffix creating abstract nouns). This follows the standard English pattern: devote (verb) → devoted (adjective) → devotedness (abstract noun).
The -ness suffix is one of English's greatest tools for turning qualities into countable nouns—we can literally weigh someone's 'devotedness' just like we measure their happiness or kindness.
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