exponent UK US /ɪkˈspəʊnənt/ noun [C]
a person who supports an idea or belief: an exponent of sth »

Adam Smith was an exponent of free trade.

a person who performs an activity: an exponent of sth »

He is one of Japan's master exponents of the art of sushi.

a number or sign which shows how many times another number is to be multiplied by itself: »

In 6³ and y², 3 and 2 are the exponents.

Financial and business terms. 2012.