Science Dictionary
advection   (ād-věk'shən)  Pronunciation Key 
  1. The transfer of a property of the atmosphere, such as heat, cold, or humidity, by the horizontal movement of an air mass.

  2. The rate of change of an atmospheric property caused by the horizontal movement of air.

  3. The horizontal movement of water, as in an ocean current.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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