multiplier

Etymology

multiply + -er.

noun

1. (arithmetic) A number by which another (the multiplicand) is to be multiplied.
   In the expression 5 × 7, the "5" is a multiplier.
   The score multiplier increases each time you complete a level of the video game.
2. (grammar) An adjective indicating the number of times something is to be multiplied.
   English multipliers include "double" and "triple".
3. (economics) A ratio used to estimate total economic effect for a variety of economic activities.
4. (physics) Any of several devices used to enhance a signal
   1. (physics, obsolete) a coil; when Johann Schweigger in 1820 invented the electric coil, increasing the electro-magnetic field from a single wire, this invention was called a multiplier.
5. A multiplier onion.
   Shallots are the most prolific of all the multipliers, and easier to grow than onions. 1995, Marian Coonse, Onions, Leeks and Garlic: A Handbook for Gardeners, page 52