Sundae/ˈsʌndeɪ/ Definition 1 of 1Pro Tip 1/3Dessert Context Used for a sweet treat, particularly after a meal. Not meant for savory dishes. We'll have burgers for lunch and maybe a sundae for dessert. Pro Tip 2/3Customizable Treat Sundaes can be personalized with various toppings to suit individual tastes. I love my sundae with extra caramel and almonds. Pro Tip 3/3Casual Occasions Sundaes are associated with casual dining and are not typically part of formal events. We all enjoyed sundaes at my friend's birthday party.