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irony
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irradiant
irradiate
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irrational number
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irrational number
ir·ra·tion·al num·ber (plural ir·ra·tion·al num·bers)


noun 
Definition:
 
real number that is not rational: any real number that cannot be expressed as the exact ratio of two integers, e.g. √2 and π
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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