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perfectly
perfecto
perfervid
perfidy
perfin
perfoliate
perforate
perforated
perforation
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perform
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perfect square
per·fect square (plural per·fect squares)


noun 
Definition:
 
kind of number: a rational number equal to the square of another rational number
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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