Etymology
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irrigation (n.)

1610s, "a supplying of water to land," also in medical use, "supply of a liquid to some part of the body," from Latin irrigationem (nominative irrigatio) "a watering, irrigation," noun of action from past participle stem of irrigare "lead water to, irrigate, flood" (see irrigate).

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Definitions of irrigation

irrigation (n.)
supplying dry land with water by means of ditches etc;
irrigation (n.)
(medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution;
From wordnet.princeton.edu