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1.
An adrian is a term of measurement, much like the Mole, Dozen, Half dozen, and Bakers dozen.

Just as the Dozen is counted as 12 of something, the Adrian is counted as a unit of 26.
"Dude, yesterday I was so stoned that I ate an adrian of donuts"

Greg:"What's the best thing about screwing Twenty Six year olds?"

Fred:"There's an Adrian of them!"
by Awesomocity June 08, 2010