Need/niːd/ Definition 1 of 4Pro Tip 1/3Urgency Emphasis Use 'need' to express something critical that should be addressed soon. I need to see a doctor immediately. Pro Tip 2/3Strong Requests When making a request, 'need' shows that you believe it's important for you to have help. I need some advice on this project. Pro Tip 3/3Personal Importance 'Need' often reflects a personal feeling of necessity, not just a general requirement. I need some time off to think.