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a. An identical twin or unrelated person who has a similar appearance to a decent or moral person but who wreaks havoc or does evil.
b. An imaginary double humorously invoked to explain or excuse uncharacteristic or reprehensible behavior.
2. A negative or malign counterpart of something considered to be positive or good: "Not every drug's side effects are caused by a molecular evil twin" (Audrey Choi).
3. A fraudulent wireless internet access point used to commit identity theft by recording the data traffic of unwitting users.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Telecommunications) a hidden wireless internet access point operating near a legitimate one, but which is actually used by cybercriminals to divert sensitive information such as account numbers and passwords
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014