exponent

Etymology

It is borrowed from Latin expōnēns (“setting forth”), stem expōnent-, the present participle of expōnō (“to put forth, set out, expound”),^{[2][3][4][5][6][7][8][9]} from ex- (“out”) and pōnō (“to put, place”).^[8][10] Barnhart thinks that the mathematical use may have been influenced by earlier French exposant, recorded in 1680, from exposer.^[4]

Earliest recorded meaning

Setting forth or interpreting, as an adjective in logic, of a proposition: 1581, in J. Bell's translation of Haddon and Foxe.^[2] Etymonline dates the adjective to the 1580s,^[5] Dictionary.com the word to 1575–85.^[11]

Semantic evolution

The noun's mathematical use is said by Etymonline to have been introduced into algebra by Descartes.^[5] Barnhart and Etymonline make the algebraic symbol the noun's earliest use, in 1706,^[4][5] while the Shorter Oxford puts that use in the late 17th century.^[7] The OED's earliest mathematical record, of 1706, is for the exponent of the ratio, the quotient of its two terms, and its first quotation for the power of a quantity is from Berkeley in 1734.^[2] Johnson (1755), quoting Harris, knew only these mathematical meanings.^[12] Exponential is recorded from 1704 in Harris's Lexicon Technicum;^[4] Barnhart supposes an unrecorded English noun behind it,^[4] while Hoad derives it from French exponentiel.^[9] The sense of one who explains or interprets is recorded from 1812, in Coleridge.^[2][4][5] From there it spread to a performer who interprets music and to a champion of an idea,^[2][10][7] and later, from 1825 in Coleridge, to a person or thing that stands as a type or symbol.^[2][7] Linguistics added the realization of a category in speech or writing, in J. R. Firth in 1957.^[2]

Timeline

• 1581 – adjective, setting forth or interpreting, in logic.^[2][5]
• 1706 – noun, a symbol showing the power of a quantity.^[4][5][6] The OED's first quotation for this is of 1734, in Berkeley, and the Shorter Oxford dates it to the late 17th century.^[2][7]
• 1812 – one who expounds or interprets, in Coleridge.^[2][4][5]
• 1825 – a person or thing that stands as a type or symbol, in Coleridge.^[2][7]
• 1957 – in linguistics, a realization of a category or feature, in J. R. Firth.^[2][7]

Meanings

Noun

1. A number or symbol written above and to the right of another to show its power, as the 3 in 2³.^[6][10][2]
2. A person who explains or argues for an idea or cause; an advocate: a leading exponent of free trade.^[6][10][7]
3. A performer or interpreter of an art, especially a musician.^[6][10][2]
4. A person or thing that stands as a type or symbol of something.^[2][7]
5. (linguistics) An instance of a linguistic category or feature in speech or writing.^[2][7]
6. (obsolete) In exponent of the ratio, the quotient of its two terms.^[2][12]

Adjective

1. Explaining or interpreting; serving as an example.^{[6][10][7][2]}

Word family

• exponentiation
• exponential
• exponentiate

Related words

• expose
• expound
• expone
• exposition

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
4. ^ a b c d e f g h Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
5. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
6. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b c d e f g h i j k Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
8. ^ a b Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
9. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
10. ^ a b c d e f Collins English Dictionary (2023), Glasgow: HarperCollins
11. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
12. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.