continental drift

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The movement, formation, or re-formation of continents described by the theory of plate tectonics.

from the GNU version of the Collaborative International Dictionary of English.

• the movements of continents relative to each other across the Earth's surface; see plate tectonics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun geology The slow movement of continents explained by plate tectonics.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the gradual movement and formation of continents (as described by plate tectonics)