exponent
noun [ C ] uk/ɪkˈspəʊ.nənt/ us/ɪkˈspoʊ.nənt/
(PERSON)
（想法或信仰的）拥护者，鼓吹者；（某活动的）能手
a person who supports an idea or belief or performs an activity
Adam Smith was an exponent of free trade. 亚当‧斯密提倡自由贸易。
Jacqueline du Pré was a leading exponent of the cello. 杰奎琳•杜普雷是一流的大提琴演奏大师。
(NUMBER)
mathematics specialized指数
a number or sign that shows how many times another number is to be multiplied by itself
In 64 and yn, 4 and n are the exponents. 在64和yn中，4和n是指数。