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AES is short for Advanced Encryption Standard. It has two definitions:

1) The process in which the U.S. government (NIST) approves a cryptographic standard.

2) The winner of the latest U.S. government cryptographic testing. In this case, Rijndael won. It's a block cipher with a 128-bit block size. It uses a 128-bit, 192-bit or 256-bit key size and is considered to be extremely secure.
The Serpent cipher came a close second to Rijndael in the AES competition.

It's encrypted with 256-bit AES, there's no way you can crack it!
by PorkWaffle January 02, 2012
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n. Awkward Ending Syndrome
When you say good-bye to someone and then realize you're walking in the same direction so you start walking very slowly and hope they walk faster. That's an instance of obvious AES (awkward ending syndrome).

There are countless others.
by mrsmarkmarx August 18, 2011
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