Party/ˈpɑːrti/ Definition 1 of 5Pro Tip 1/3Social Gathering Often implies fun and celebration, usually among friends and family. You're invited to our Halloween party next week! Pro Tip 2/3Planning Required Usually involves organization for food, music, and activities. They spent weeks planning their wedding party. Pro Tip 3/3Event Invitation An event where guests are usually invited with a notice in advance. Did you get an invite to her birthday party?