Usually means: Ratio of precipitation to evapotranspiration.
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We found 6 dictionaries that define the word aridity index:

General (3 matching dictionaries)
  1. aridity index: Infoplease Dictionary
  2. aridity index: Dictionary.com
  3. Aridity index: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. aridity index, Aridity index: Encyclopedia

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

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Definitions from Wikipedia (Aridity index)

▸ noun:  An aridity index is a numerical indicator of the degree of dryness of the climate at a given location.


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