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Definition of exponent:
 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
 One who, or that which, stands as an index or representative; as, the leader of a party is the exponent of its principles.
Synonyms:
average, ideologue, adherent, champion, follower, tycoon, example, backer, hierophant, force, paladin, true believer, type, index finger, big businessman, indicator, top executive, great power, interpreter, advocate, index number, guru, protagonist, herald, proponent, representative, artist, power, approximation, calculation, old hand, binomial, business leader, maestro, counsellor, past master, powerfulness, apostle, queen, practitioner, counseloratlaw, white knight, pleader, deviation, decimal place, master, major power, sympathizer, forefinger, counsel, counselor, sponsor, office, friend, mogul, advocator, promoter, best, king, baron, gospeler, espouser, prodigy, mightiness, supporter, might, superman, high priest, index, superpower, indicant, expounder, abacus, specimen, magnate, ability, computational, tubthumper, booster, world power, countdown.

mathematics (part of speech: noun)
 divisor,
 multiplicator,
 cube root,
 cube,
 multiple,
 algorithm,
 increment,
 denominator,
 geometry,
 logarithm,
 root,
 multiplier,
 quotient,
 dividend,
 fraction,
 factor,
 radix,
 differential calculus,
 square root,
 quadratics,
 multiplicand,
 trigonometry,
 coefficient,
 calculus,
 arithmetic,
 numerator,
 modulus,
 antilogarithm,
 subtrahend,
 formula,
 algebra,
 power,
 index,
 minuend,
 integral,
 reciprocal,
 algorithm
Usage examples:

And he was far from being an exponent to stern British morality.
 "Superwomen", Albert Payson Terhune. 
Well, we are each, don't you think, to write a letter, as sensible, honest, and piquant as we can make it, historic, sentimental, poetic, or otherwise, as we please, so that it be the honest exponent of our views.
 "Ester Ried", Pansy (aka. Isabella M. Alden). 
His language, too, was not only less refined and flowing, but also less scientifically correct, than that of his distinguished exponent and successor.
 "Leading Articles on Various Subjects", Hugh Miller.