A quantity upon which a mathematical operation is performed

• Equation quantity
• Modus ___
• Divisor, e.g.
• Mathematical quantity acted upon
• Either 2 in 2 + 2 = 4, in math

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Operand \Op"er*and\, n. [From neuter of L. operandus, gerundive of operari. See Operate .] (Math.) The symbol, quantity, or thing upon which a mathematical operation is performed; -- called also faciend .

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

WordNet Word definitions in WordNet
n. a quantity upon which a mathematical operation is performed