Happy/ˈhæpi/ Definition 1 of 4Pro Tip 1/3Emotional State Used when expressing a person's mood, usually with emphasis on positivity or joy. She was so happy to see her friends after a long time. Pro Tip 2/3Event Reaction Commonly used to react to events with a positive outcome or to good news. They were happy to hear the wedding bells. Pro Tip 3/3Shared Joy Indicates pleasure or contentment shared with others or because of someone's success. We're so happy for your academic achievements!