Physicalism

Physicalism: The idea that everything is physical, or is necessitated by the physical.

Note: Physicalists don’t deny that the world might contain many items that at first glance don’t seem physical — items of a biological, or psychological, or moral, or social nature. But they insist nevertheless that at the end of the day such items are either physical or supervene on the physical. From: http://plato.stanford.edu/entries/physicalism/#4.