The phrase "duly noted" is often used to indicate that something has been acknowledged or observed in a proper and appropriate manner. It conveys that the speaker has recognized the information provided, and it is officially recorded or understood. It is commonly used in professional or formal contexts to reassure someone that their input or concerns have been taken seriously.
The phrase combines "duly," which comes from the Old French "duel" meaning "properly" or "fittingly," and "noted," derived from the Latin word "nota" meaning "mark" or "sign." Together, they imply that something has been appropriately marked or acknowledged.