In a manner showing applause or approval; with clapping or cheering.
From applauding (present participle of applaud) plus the adverbial suffix -ly. This creates an adverb describing how something is done with approval or enthusiasm.
While you might describe someone's actions as 'applaudable,' you'd describe a crowd's response as 'applaudingly'—they're cheering and clapping in a positive way. It's the difference between deserving applause and actively giving it!
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