Definitions

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

  • noun The scientific study of the origin, history, and structure of the earth.
  • noun The structure of a specific region of the earth's crust.
  • noun A book on geology.
  • noun The scientific study of the origin, history, and structure of the solid matter of a celestial body.

from The Century Dictionary.

  • noun ;
  • noun The geological conditions or features of a place: as, the geology of a district.
  • noun The science of the past and present condition of the earth, with special reference to the physical changes which it has undergone or which may still be taking place.

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

  • noun The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series.
  • noun A treatise on the science.

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

  • noun The science that studies the structure of the earth (or other planets), together with its origin and development, especially by examination of its rocks

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

  • noun a science that deals with the history of the earth as recorded in rocks

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Medieval Latin geōlogia, study of earthly things : Greek geō-, geo- + Greek -logiā, -logy.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Modern Latin geologia, from Ancient Greek γῆ (gē, "earth") + -logia ("-logy").

Examples

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