Hat/hæt/ Definition 1 of 3Pro Tip 1/3Weather Dependent Hats are often worn based on the weather—warm hats for cold days and visored hats for sunny ones. Grab your woolly hat, it's freezing today! Pro Tip 2/3Social Events Hats can be essential for social occasions such as weddings or horse races in some cultures. She chose a fancy hat for the royal wedding. Pro Tip 3/3Cultural Symbol Certain hats symbolize professions or rank, like police hats or chefs' toques. The conductor's hat signaled his authority on the train.