n. [ Cf. F. multiplier. Cf. Multiplicator. ] 1. One who, or that which, multiplies or increases number. [ 1913 Webster ]
2. (Math.) The number by which another number (the multiplicand) is multiplied. See the Note under Multiplication. [ 1913 Webster ]
3. (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. [ 1913 Webster ]