In a manner that expresses disagreement or opposition to something.
From 'dissent' (Latin dissentire: dis- 'apart' + sentire 'to feel') plus the adverbial suffix -ly. The -ing form adds the present participle suffix before the adverbial marker.
This word shows how English builds complexity through layering: one Latin root gets transformed through participial and adverbial affixes, allowing us to describe disagreement not just as an action but as the *manner* of doing it.
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