thaumaturgy \THAW-muh-tuhr-jee\ (noun) - The performance of miracles or magic.
"That's where I was really good -- thaumaturgy. Thaumaturgy is traditional magic, all about drawing symbolic links between items or people and then investing energy to get the effect that you want." -- Jim Butcher, 'Grave Peril'
Thaumaturgy comes from the Greek words for "wonder" (thauma) and "work" (ergon). A practitioner of thaumaturgy is a thaumaturgist or thaumaturge.