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2 definitions by Jeff Carter

 
1.
!
In the mathematical sense, it means factorial. The definition of factorial is as follows: n*(n-1)*(n-2)*(n-3)*(n-...), (n-1) > 0.
The factorial of 5 = 5*4*3*2*1 = 120.
by Jeff Carter January 17, 2005
 
2.
To sleep, rest, or take a nap
I was catching z's during study hall.
by Jeff Carter January 17, 2005