—n.
1 a person who favours or promotes an idea etc.
2 a representative or practitioner of an activity, profession, etc.
3 a person who explains or interprets something.
4 an executant (of music etc.).
5 a type or representative.
6 Math. a raised symbol or expression beside a numeral indicating how many times it is to be multiplied by itself (e.g. 2(3) = 2 x 2 x 2).
—adj. that sets forth or interprets.
Etymology: L exponere (as EX-(1), ponere posit- put)
Useful english dictionary. 2012.