An archaic or dialectal past participle of 'write,' meaning written or composed in older English.
From Old English 'writan,' related to Germanic languages. The form 'witten' represents an older strong verb conjugation pattern that has mostly disappeared from modern English except in some dialects and historical texts.
This is a ghost word from when English verbs worked differently—people used to say 'witten' the way we'd say 'written' today, but the language simplified over centuries, dropping these extra forms.
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