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Webster 1913 Edition

Noun.

[From neuter of L.

operandus

, gerundive of

operari

. See

(Math.)

The symbol, quantity, or thing upon which a mathematical operation is performed; – called also

faciend

operand ‎(plural operands)

(mathematics, computing) A quantity to which an operator is applied (in $3-x$ , the operands of the subtraction operator are 3 and $x$ ).
- 1992, Michael A. Miller, The 68000 Microprocessor Family: Architecture, Programming, and Applications (page 47)
  When the microprocessor decodes the JSR opcode, it stores the operand into the TEMP register and pushes the current contents of the PC ($00 0128) onto the stack.

quantity to which an operator is applied