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Definition of personal identification number - 2 dictionary results
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Computing Dictionary

Personal Identification Number security
(PIN, "PIN number") A password, typically four digits entered through a telephone keypad or automatic teller machine.
(1996-11-03)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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