Soiree/swɑːˈreɪ/ Definition 1 of 1Pro Tip 1/3Evening Event A soiree happens in the evening. If it's in the daytime, it's not a soiree. The garden looked beautiful for the evening soiree. Pro Tip 2/3Formal Gathering Soirees are often formal or semi-formal. Guests may dress up more than for a casual get-together. He wore his new suit to the charity soiree. Pro Tip 3/3Cultural Elegance The word 'soiree' suggests a cultural or sophisticated atmosphere, not just any party. Their soiree included a live classical music performance.