According to the famous occultist
Aleister Crowley, magick is "the Science and Art of causing Change to occur in conformity with Will." ... In fact, Crowley... says that "every intentional act is a Magickal Act." If you follow his line of reasoning, there is a great deal of validity in what he says, although it is not what we are seeking at this time. We need to make the definition of magick a bit longer:
Magick is the science and art of causing change (in consciousness) to occur in conformity with will, using means not currently understood by traditional Western science.