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

  • noun Any of several essentially geologic sciences that are concerned with the origin, structure, and physical phenomena of the earth.

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

  • noun Any of the sciences dealing with the planet Earth, such as geology and meteorology.

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

  • noun any of the sciences that deal with the earth or its parts


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