logarithm
noun [ C ] uk/ˈlɒɡ.ə.rɪ.ðəm/ us/ˈlɑː.ɡə.rɪ.ðəm/ (informal log)
对数
the number that shows how many times a number, called the base, has to be multiplied by itself to produce another number. Adding or taking away logarithms can replace multiplying or dividing large numbers.