n. & adj.
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.
[ L exponere (as EX-(1), ponere posit- put) ]