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1.
Taken from the proper name (Excel) of the popular MS Office product, and the general name for the aritmetic in which symbols represent numbers or sets of numbers along with the mathematical operations applied to them. The process of creating (sometimes) long, complicated, algebraic formulas in Microsoft Excel, usually using cell references in place of variables.
Jeez, my eyes are crossed from doing Excelgebra all night.
by StBill October 04, 2010