In a manner that contributes to or helps bring about a particular result.
From 'conducing' plus the adverbial suffix '-ly,' which comes from Old English 'lice' (like, in the manner of). This suffix has been used since Old English to convert adjectives and participles into adverbs.
English adverbs are like the invisible choreographers of sentences—they modify verbs by adding the '-ly' suffix, creating thousands of new words from existing ones, which is why 'conducingly' exists even though it's quite rare.
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