Gaiety/ˈɡeɪəti/ Definition 1 of 1Pro Tip 1/3Social Happiness Use 'gaiety' to describe collective joy in group events like parties or festivals. The gaiety at the carnival was contagious. Pro Tip 2/3Vibrant Atmosphere 'Gaiety' often implies an environment filled with lively energy and colors. The parade was full of gaiety, with music and dancers everywhere. Pro Tip 3/3Celebratory Moments Use it when referring to short, joyful instances, not prolonged periods of happiness. A burst of gaiety erupted when she announced her engagement.