LOGARITHM

[informal] log [noun] [C] - the number which shows how many times a number, called the base, has to be multiplied by itself to produce another number. Adding or subtracting logarithms can replace multiplying or dividing large numbers.The logarithm of 1 000 000 in base 10 is 6.Look up the log of 14.73 in your logarithm/log tables (= book containing a list of logarithms).