An ade is a sweet, cold summer drink. Most ades are based on fruit juice.
Ade is a slang term for a sweet drink, more often used as a suffix. The most common kind of ade is lemonade, though you might also see limeade on a menu. Both of these drinks are made with fruit juice that's diluted with water and sweetened with sugar or honey. In Britain, an orangeade is a fizzy, carbonated drink.