multiplier

Concise Oxford English Dictionary © 2008 Oxford University Press:
multiplier/ˈmʌltɪplʌɪə(r)/

▶noun

• 1 a quantity by which a given number (the multiplicand) is to be multiplied.

• 2 Economics a factor by which an increment of income exceeds the resulting increment of saving or investment.

• 3 a device for increasing by repetition the intensity of an electric current, force, etc. to a measurable level.

• 4 a type of fishing reel with a geared spool.