Definition of aridification
: the gradual change of a region from a wetter to a drier climate
The onset of sudden aridification in Mesopotamia near 4100 calendar yr B. P. coincided with a widespread cooling in the North Atlantic …— Peter B. de Menocal, Science, 27 Apr. 2001
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Merriam-Webster unabridged
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Time Traveler for aridification
The first known use of aridification was in 1855
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