Either 2 in 2 + 2 = 4, in math

• Equation quantity
• Dividend, mathematically
• Part of an equation, in math
• A quantity upon which a mathematical operation is performed
• Part of an equation
• Divisor, e.g
• Target of a mathematical process
• Divisor, e.g.

Wiktionary Word definitions in Wiktionary
n. (context mathematics computing English) A quantity to which an operator is applied (in 3 - x , the operands of the subtraction operator are 3 and x ).

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