Ron: Wingardium LeviosAA!
Hermione: Stop! Stop! Stop! You're going to take someone's eye out! Besides, you're saying it wrong. It's LeviOsa, not LevioSA.
Ron: You do it then if you're so clever. Go on, go on.
Hermione: Wingardium Leviosa!
In the Wizarding world, a levitation spell used to lift objects - such as feathers, sticks, etc - in the air. To perform this spell, it requires a swish and flick of your designated wand.
According to the brightest witch of our age, it is pronounced Wingardium leviOsa, not leviosA.