the artificial application of water to land to assist in the production of crops.
Medicine/Medical. the flushing or washing out of anything with water or other liquid.
the state of being irrigated.

1605–15; < Latin irrigātiōn- (stem of irrigātiō). See irrigate, -ion

irrigational, adjective
nonirrigation, noun
overirrigation, noun
preirrigation, noun
preirrigational, adjective
proirrigation, adjective
reirrigation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irrigate (ˈɪrɪˌɡeɪt)
1.  to supply (land) with water by means of artificial canals, ditches, etc, esp to promote the growth of food crops
2.  med to bathe or wash out a bodily part, cavity, or wound
3.  (tr) to make fertile, fresh, or vital by or as if by watering
[C17: from Latin irrigāre, from rigāre to moisten, conduct water]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Cultural Dictionary

irrigation definition

Artificial provision of water to sustain growing plants.

Note: Irrigation accounts for the greatest part of water usage in the western United States.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Irrigation definition

As streams were few in Palestine, water was generally stored up in winter in reservoirs, and distributed through gardens in numerous rills, which could easily be turned or diverted by the foot (Deut. 11:10). For purposes of irrigation, water was raised from streams or pools by water-wheels, or by a shaduf, commonly used on the banks of the Nile to the present day.

Easton's 1897 Bible Dictionary
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Example sentences
The poplar-trees watch beside the irrigation-ditches.
Dams, irrigation and now climate change have drastically reduced the
  once-mighty river.
You'd reduce water use and end runoff by recycling water in a closed irrigation
And dams allow irrigation, which can transform the land in the area, possibly
  leading to local climactic impacts.
Images for irrigation
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