Laugh/læf/ Definition 1 of 5Pro Tip 1/3Social Reaction Use when responding to humor or joy in social situations. The audience laughed after the comedian's punchline. Pro Tip 2/3Group Dynamics Laughing can indicate belonging to a group by sharing in the amusement. At lunch, they all laughed at an inside joke. Pro Tip 3/3Positive Atmosphere Indicates a light-hearted, positive environment when people laugh together. The party was full of laughter and good vibes.