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irritation
irrupt
irruption
irruptive
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irreversible
ir·re·vers·i·ble [ ìrri vúrssəb'l ]


adjective 
Definition:
 
incapable of reversal: impossible to reverse or undo

ir·re·vers·i·bil·i·ty [ ìrri vurssə bíllətee ] noun
ir·re·vers·i·ble·ness [ ìrri vúrsəb'lnəss ] noun
ir·re·vers·i·bly adverb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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