Sir
From open-dictionary.com - the free dictionary.
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Etymology
Via Norman French from Latin senior, older or elder, from senex, old
Noun
sir or Sir
- A man of a higher rank or position
- An address to a military superior
- An address to any male, especially if his name or proper address is unknown
- Example: Excuse me, sir, could you tell me where the nearest bookstore is?
- (British) A title given a male knight or baronet