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arid·i·fi·ca·tion | \ ə-ˌri-də-fə-ˈkā-shən 
, a- \
, a- \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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The first known use of aridification was in 1855
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