Mathematical quantity acted upon

• Divisor, e.g.
• A quantity upon which a mathematical operation is performed
• Either 2 in 2 + 2 = 4, in math
• Equation quantity
• Dividend, mathematically
• Part of an equation
• Quantity on which a math operation is performed

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1886, from Latin operandum , neuter gerundive of operari (see operation ).

Wikipedia Word definitions in Wikipedia
In mathematics , an operand is the object of a mathematical operation , a quantity on which an operation is performed.