exponent Definition

exponent
noun

1. Someone able to perform some art or activity, especially skilfully.
2. Someone who explains and promotes (a theory or belief, etc).

Thesaurus: advocate, supporter, backer, proponent; expounder, interpreter.
3. math.
A number that indicates how many times a given quantity, called the base, is to be multiplied by itself, usually denoted by a superscript number or symbol immediately after the quantity concerned, eg 64 = 6 ′ 6 ′ 6 ′ 6. Also called power, index.

Etymology: 16c: from Latin exponere to set out.