In a conventional manner; according to established customs, standards, or accepted norms.
From 'conventional' + '-ly' (adverbial suffix from Old English '-lice'). The '-ly' ending is one of the most productive in English, converting adjectives to adverbs.
A lawyer might conventionally dress in a suit, but some of the best lawyers are the ones who break that rule and win by challenging what 'conventionally' works.
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