Raillery is playful teasing or good-natured joking between friends. When you engage in raillery with your classmates, you might joke about someone's new haircut or tease a friend about their favorite team losing, but everyone knows it's all in fun. The key is that raillery never aims to hurt: it's the kind of back-and-forth banter where everyone's laughing, including the person being teased.

Think of the difference between raillery and mean teasing. If your friend trips in the cafeteria and you say with a grin, “Nice moves, butterfingers!” and they laugh too, that's raillery. But if they look embarrassed and you keep going, it crosses into cruelty. True raillery requires mutual respect and trust. It's the verbal sparring that happens between friends who know each other well enough to joke without causing real offense.

You might hear the word in older books where characters engage in witty raillery at dinner parties, exchanging clever jokes and playful insults. While we don't use the word as much in everyday conversation anymore, the practice itself is alive and well wherever friends gather to joke, tease, and laugh together.