Behind the Harry Potter Magic Spells

Wingardium Leviosa! Expelliarmus! Alohomora! Pengen know what the true meaning of magic spells in the world of Harry Potter? The Harry Potter freaks would've know what will happen we reply brandishing a wand and shouted, "Avada Kedavra!". Or spell what to say we if wan open the locked door ( "Alohomora!"). But do not ever i think if J.K. Rowling, creator of Harry Potter, it did not