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1.
1. An unknown number in a math equation.

2. A named region of memory in a computer program.
1. 3=5x solve for the variable x.

2. Don't use global variables; keeping track of all the subroutines modifying the same memory gets very confusing very fast.
by N0TR1DDL3 June 22, 2014
 
2.
Someone who experiences extreme variations of his intelligence.
This guy is a real variable! You never know whether he's going to explain quantum physics or jump around like a monkey!
by Variable April 26, 2003