Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun One that expounds or interprets.
 noun One that speaks for, represents, or advocates.
 noun Mathematics A number or symbol, as 3 in (x + y)^{3}, placed to the right of and above another number, symbol, or expression, denoting the power to which that number, symbol, or expression is to be raised.
 adjective Expository; explanatory.
from The Century Dictionary.
 Exemplifying; explicating.
 noun One who expounds or explains.
 noun One who or that which stands as an index or representative; one who or that which exemplifies or represents the principle or character of something: as, the leader of a party is the exponent of its principles.
 noun In algebra, a symbol placed above and at the right of another symbol (the base), to denote that the latter is to be raised to the power indicated by the former.
 noun A particular example illustrating the meaning of a general statement.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Alg.) A number, letter, or any quantity written on the right hand of and above another quantity, and denoting how many times the latter is repeated as a factor to produce the power indicated.
 noun One who, or that which, stands as an index or representative.
 noun one who explains, expounds, or interprets.
 noun [R.] the quotient arising when the antecedent is divided by the consequent; thus, 6 is the
exponent of the ratio of 30 to 5.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun One who
expounds ,represents oradvocates  noun mathematics The
power to which anumber ,symbol orexpression is to beraised . For example, the 3 in x3.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a mathematical notation indicating the number of times a quantity is multiplied by itself
 noun someone who expounds and interprets or explains
 noun a person who pleads for a cause or propounds an idea
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
Examples

June 23rd, 2006 at 4: 46 pm jealousofjeff says: nope jason pissant – exponent is what I meant. proponent is just a synonym. sort of like assclown is to pissant. assclown
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The short term exponent of about 1.5 is not too different from 5/3.
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Perhaps its bestknown living exponent is Marshal Pétain.

 Or the question may be more unanswerably stated thus, Is _good_ superfluous as a word exponent of a _kind_?

Picture of Shahenshah Baba the greatest Rafaee sword exponent ..
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One has to keep in mind that numbers increase very, very quickly as the superscript called the exponent increases.

One has to keep in mind that numbers increase very, very quickly as the superscript called the exponent increases.

One has to keep in mind that numbers increase very, very quickly as the superscript called the exponent increases.

One has to keep in mind that numbers increase very, very quickly as the superscript called the exponent increases.

Dear Freddy, the exponentially decreasing saturating formula is assuming that there is a universal value of the coefficient that I wrote as 1/200″ in the exponent, which is only reasonable if you study the absorption at one frequency.
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