In a polite, respectful, and considerate manner; with good manners and courtesy shown in one's actions or speech.
From 'courteous' (polite, of court quality) + '-ly' (adverb forming suffix). 'Courteous' comes from Old French 'corteis,' meaning 'of the court,' suggesting that politeness was historically associated with court behavior.
Interestingly, 'courteous' evolved from 'court-like' because medieval nobles were expected to display elaborate politeness as a marker of their rank—rudeness was literally considered un-noble behavior.
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