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autarky
autecology
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authentication

au·then·ti·ca·tion [ aw thèntə káysh'n ]


noun 
Definition:
 
1. proof of validity: the act of proving something to be genuine or valid, or the evidence used in so doing

2. user identification: a security measure using data encryption that identifies the user and verifies that the message was not tampered with ( used in e-commerce )

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