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aide
noun
An assistant or helper, especially an officer who acts as assistant to a more senior official. Commonly refers to a personal assistant to a high-ranking government official, military officer, or executive who provides support and handles administrative duties.
Etymology
Origin: French
Root: aide (aid; assistant) — "down, away from, removing"
Example
"The senator's aide quickly briefed her on the latest polling data before she entered the committee meeting."
Usage Notes
Aide implies a formal, professional relationship with someone in authority, often in government or military contexts. More specific than 'assistant' - suggests someone trusted with sensitive duties. Common in phrases like 'presidential aide' or 'aide-de-camp.' Register is formal to neutral. Don't confuse with 'aid' (help/assistance).