noun one who, or that which, multiplies or increases number.
2. multiplier ·noun the number by which another number is multiplied. ·see the note under multiplication.
3. multiplier ·noun 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.