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perilous
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periodicity
pe·ri·o·dic·i·ty [ pree ə díssətee ]


noun 
Definition:
 
1. regular recurrence: recurrence at regular intervals
2. chemical similarity: similarity between the properties of chemical elements that are close to each other in the periodic table
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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