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proof•ing



Pronunciation: (prOO'fing), [key]
n.
1. the act or process of making a thing resistant, as in waterproof fabrics or fireproof material.
2. any chemical used in the manufacture of a substance to make it proof against water, fire, etc.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

proofproof-of-purchase

 

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