Definitions

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

  • noun The process of erosion and deposition in which a nearly level surface is produced, as by streams, wind, or ocean currents.

from The Century Dictionary.

  • noun The act of planing or making plane or flat; specifically, in geology, the erosive process by which a stream or a glacier produces a nearly level surface; also the result of erosive processes.

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

  • noun geology The formation of a flat surface by erosion and deposition.
  • noun biology The morphological transformation of a three-dimensional structure into a two-dimensional one through development or evolution.

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

  • noun the process of erosion whereby a level surface is produced

Etymologies

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

[Latin plānum, flat surface; see plane + –ation.]

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