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natural gas
natural history
natural killer cell
natural language
natural language processing
natural law
natural light
natural logarithm
natural medicine
natural monopoly
natural number
natural philosophy
natural rate of unemployment
natural resource
Natural Resources Canada
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natural aging
nat·u·ral ag·ing


noun 
Definition:
 
physical changes in material over time: physical changes that occur within a material over time at normal temperatures
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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