In a manner that emphasizes something strongly and earnestly, often by repeated or solemn statements.
From asseverate (Latin asseverare: 'to assert seriously') + -ing + -ly. The root comes from ad- (to) + severus (strict, serious), meaning to treat something with utmost seriousness.
This word reveals how speakers once needed a special way to show they weren't just saying something casually—asseverating meant putting your reputation behind your words, like swearing an oath in court.
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