Sir/sɜːr,sər/ Definition 1 of 3Pro Tip 1/3Power Dynamics Use 'sir' to show respect or deference, often to someone with more authority or age. I'll get right on it, sir. Pro Tip 2/3Gender Specific 'Sir' is only used to address or refer to males; 'ma'am' is the female equivalent. Excuse me, sir, is this your wallet? Pro Tip 3/3Customer Service In service environments, 'sir' adds a formal and polite tone to interactions. Would you like anything else, sir?