The American Heritage® Dictionary of the English Language, 4th Edition
adj. Extending beyond or transcending established borders or spheres of influence held by separate nations: a supranational economy; supranational federations.
adj. Beyond the borders or scope of any one nation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. transcending established national boundaries or spheres of interest
Word Usage
"The United Nations in particular, held in check by the veto power of each permanent member of the Security Council, could not plausibly be described as a supranational world government."