[sem-ee-ar-id, sem-ahy-]
adjective (of a region, land, etc.)
characterized by very little annual rainfall, usually from 10 to 20 inches (25 to 50 cm): the struggle to raise vegetables in semiarid regions.

1895–1900, Americanism; semi- + arid

semiaridity [sem-ee-uh-rid-i-tee, sem-ahy-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semiarid (ˌsɛmɪˈærɪd)
characterized by scanty rainfall and scrubby vegetation, often occurring in continental interiors: the semiarid regions of Australia

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
semiarid   (sěm'ē-ār'ĭd)  Pronunciation Key 
Having low precipitation but able to support grassland and scrubby vegetation. Steppes have semiarid climates.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Arid and semiarid climates can occur when warm, moist air is blocked by
There are a large number of plants that do well in our semiarid climate with
  little or no supplemental irrigation.
Modeling of full and limited irrigation scenarios for corn in a semiarid
Arid and semiarid lands respond swiftly and dramatically to changes in climate.
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