1. One who, or that which, multiplies or increases number.
2. (Science: mathematics) The number by which another number is multiplied. See the note under multiplication.
3. (Science: physics) An instrument for multiplying or increasing by repetition or accumulation the intensity of a force or action, as heat or electricity. It is particularly used to render such a force or action appreciable or measurable when feeble. See Thermomultiplier.
Origin: Cf. F. Multiplier. Cf. Multiplicator.