Magic is the art of unexplained acts. Those who are able to practice it are wizards.

More stricly speaking, magic is a piece of information or occurence that is believed to be unexplainable by rational or scientific means and is implied to never be explainable. Not every strange act should be immediately called magic, but it should be understood the entirety of life cannot be filtered through a rationalist siv, it has to be awed at.

Religions and certain philosophies directly acknowledge magic.