ex ‧ po ‧ nent /ɪkˈspəʊnənt $ -ˈspoʊ-/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: present participle of exponere ; ⇨ ↑ expose ]
1 . an exponent of an idea, belief etc tries to explain it and persuade others that it is good or useful
a leading exponent of desktop publishing
2 . an exponent of a particular skill, idea, or activity is someone who is good at it
The most famous exponent of this approach to art was probably Charles Rennie Mackintosh.
3 . technical a sign written above and to the right of a number or letter to show how many times that quantity is to be multiplied by itself