1.  exponent(n = noun.person) advocate, advocator, proponent - a person who pleads for a cause or propounds an idea;
is a kind of individual, mortal, person, somebody, someone, soul
has particulars: apologist, justifier, vindicator, constitutionalist, darwinian, democrat, populist, federalist, gnostic, humanist, humanitarian, ideologist, ideologue, internationalist, irredentist, irridentist, isolationist, jansenist, libertarian, maoist, marxist, nationalist, neoclassicist, neutralist, nullifier, drumbeater, partisan, zealot, partitionist, platonist, pro-lifer, presenter, sponsor, protectionist, republican, ritualist, ruralist, secessionist, secularist, separationist, separatist, interpreter, representative, spokesperson, voice, suffragist, admirer, booster, champion, friend, protagonist, supporter, supremacist, teleologist, thatcherite, unilateralist

2.  exponent(n = noun.person) - someone who expounds and interprets or explains;
is a kind of intellect, intellectual
Derived form verb expound₁

3.  exponent(n = noun.communication) index, power - a mathematical notation indicating the number of times a quantity is multiplied by itself;
is a kind of mathematical notation
has particulars: degree, log, logarithm
Derived form adjective exponential₁

1.  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
"thus a2 denotes the second power, and ax the xth power, of a (2 and x being the exponents). A fractional exponent, or index, is used to denote the root of a quantity. Thus, a denotes the third or cube root of a." [1913 Webster]

2.  One who, or that which, stands as an index or representative; as, the leader of a party is the exponent of its principles. [1913 Webster]

3.  one who explains, expounds, or interprets. [PJC]

exponent, 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.

Etymology:
L exponere (as EX-(1), ponere posit- put)

N  number, symbol, numeral, figure, cipher, digit, integer, counter, round number, formula, function, series, sum, difference, complement, subtrahend, product, multiplicand, multiplier, multiplicator, coefficient, multiple, dividend, divisor, factor, quotient, submultiple, fraction, rational number, surd, irrational number, transcendental number, mixed number, complex number, complex conjugate, numerator, denominator, decimal, circulating decimal, repetend, common measure, aliquot part, prime number, prime, relative prime, prime factor, prime pair, reciprocal, totient, binary number, octal number, hexadecimal number, permutation, combination, variation, election, ratio, proportion, comparison, progression, arithmetical progression, geometrical progression, harmonical progression, percentage, permilage, figurate numbers, pyramidal numbers, polygonal numbers, power, root, exponent, index, logarithm, antilogarithm, modulus, base, differential, integral, fluxion, fluent, numeral, complementary, divisible, aliquot, reciprocal, prime, relatively prime, fractional, decimal, figurate, incommensurable, proportional, exponential, logarithmic, logometric, differential, fluxional, integral, totitive, positive, negative, rational, irrational, surd, radical, real, complex, imaginary, finite, infinite, impossible, numerically, modulo.

N  interpreter, expositor, expounder, exponent, explainer, demonstrator, scholiast, commentator, annotator, metaphrast, paraphrast, glossarist, prolocutor, spokesman, speaker, mouthpiece, dragoman, courier, valet de place, cicerone, showman, oneirocritic, (Edipus, oracle).

N  information, enlightenment, acquaintance, knowledge, publicity, data, communication, intimation, notice, notification, enunciation, annunciation, announcement, communiqu_e, representation, round robin, presentment, case, estimate, specification, report, advice, monition, news, return, account, statement, mention, acquainting, instruction, outpouring, intercommunication, communicativeness, informant, authority, teller, intelligencer, reporter, exponent, mouthpiece, informer, eavesdropper, delator, detective, sleuth, mouchard, spy, newsmonger, messenger, amicus curiae, valet de place, cicerone, pilot, guide, guidebook, handbook, vade mecum, manual, map, plan, chart, gazetteer, itinerary, hint, suggestion, innuendo, inkling, whisper, passing word, word in the ear, subaudition, cue, byplay, gesture, gentle hint, broad hint, verbum sapienti, a word to the wise, insinuation, information theory, bit, byte, word, doubleword, quad word, paragraph, segment, magnetic media, paper medium, optical media, random access memory, RAM, read-only memory, ROM, write once read mostly memory, WORM, informed, communique, reported, published, expressive, explicit plain spoken, (artless), nuncupative, nuncupatory, declaratory, expository, enunciative, communicative, communicatory, from information received, a little bird told me, I heard it through the grapevine.

N  indication, symbolism, symbolization, semiology, semiotics, semeiology, semeiotics, Zeitgeist, characteristic, diagnostic, lineament, feature, trait, fingerprint, voiceprint, footprint, noseprint, cloven hoof, footfall, recognition (memory), diagnostic, divining rod, detector, sign, symbol, index, indice, indicator, point, pointer, exponent, note, token, symptom, dollar sign, dollar mark, type, figure, emblem, cipher, device, representation, epigraph, motto, posy, gesture, gesticulation, pantomime, wink, glance, leer, nod, shrug, beck, touch, nudge, dactylology, dactylonomy, freemasonry, telegraphy, chirology, byplay, dumb show, cue, hint, clue, clew, key, scent, signal, signal post, rocket, blue light, watch fire, watch tower, telegraph, semaphore, flagstaff, cresset, fiery cross, calumet, heliograph, guidon, headlight, mark, scratch, line, stroke, dash, score, stripe, streak, tick, dot, point, notch, nick, print, imprint, impress, impression, keyboard symbols, printing symbols, red letter, italics, sublineation, underlining, bold font, jotting, note, annotation, reference, blaze, cedilla, guillemets, hachure, quotation marks, ", double quotes, " ", parentheses, "( )", brackets, "", braces, "", left arrow, "<", right arrow, ">", forward slash, "/", backward slash, "\", exclamation point, "!", commercial at, "@", pound sign, "#", percent sign, "%", carat, "", ampersand, "&", asterisk, "*", hyphen, "-", dash, "-", "_", em dash, "--", plus sign, "+", equals sign, "=", question mark, "?", period, ", ", semicolon, ", ", colon, ":", comma, ", ", apostrophe, "'", single quote, "'", tilde, "~", badge, criterion, countercheck, countermark, countersign, counterfoil, duplicate, tally, label, ticket, billet, letter, counter, check, chip, chop, dib, totem, tessera, card, bill, witness, voucher, stamp, cacher, trade mark, Hall mark, signature, mark, autograph, autography, attestation, hand, hand writing, sign manual, cipher, seal, sigil, signet, hand and seal, paraph, brand, superscription, indorsement, endorsement, password, watchword, catchword, security card, pass, passkey, credentials, open sesame, timbrology, mot de passe, mot du guet, pass-parole, shibboleth, title, heading, docket, address card, visiting card, carte de visite, insignia, banner, banneret, bannerol, bandrol, flag, colors, streamer, standard, eagle, labarum, oriflamb, oriflamme, figurehead, ensign, pennon, pennant, pendant, burgee, blue Peter, jack, ancient, gonfalon, union jack, banderole, old glory, quarantine flag, vexillum, yellow-flag, yellow jack, tricolor, stars and stripes, bunting, heraldry, crest, coat of arms, arms, armorial bearings, hatchment, escutcheon, scutcheon, shield, supporters, livery, uniform, cockade, epaulet, chevron, garland, love knot, favor, beacon, cairn, post, staff, flagstaff, hand, pointer, vane, cock, weathercock, guidepost, handpost, fingerpost, directing post, signpost, pillars of Hercules, pharos, bale-fire, beacon-fire, l'etoile du Nord, landmark, seamark, lighthouse, balize, polestar, loadstar, lodestar, cynosure, guide, address, direction, name, sign, signboard, warning, omen, prefigurement, trace, record, warning &c, alarm, scepter, trophy, gauge, milestone, milepost, brand, fool's cap, check, telltale, test, mileage ticket, milliary, notification, advertisement, word of command, call, bugle call, trumpet call, bell, alarum, cry, battle cry, rallying cry, angelus, reveille, sacring bell, sanctus bell, exposition &c (explanation), proof, pattern, indicating, indicative, indicatory, denotative, connotative, diacritical, representative, typical, symbolic, pantomimic, pathognomonic, symptomatic, characteristic, demonstrative, diagnostic, exponential, emblematic, armorial, individual, known by, recognizable by, indicated, pointed, marked, denotable, indelible, in token of, symbolically, in dumb show, ecce signum, ex ungue leonem, ex pede Herculem, vide ut supra, vultus ariete fortior.