latent

Etymology

It is borrowed from Middle French latent (“hidden, not apparent”), recorded in French from 1370–2,^[2][3] and directly borrowed from Latin latēns (“hidden, concealed, secret”),^{[2][3][4][5][6]} the present participle of lateō (“to lie hidden”).^[2][4][7][8] The Latin verb shares an Indo-European base with Ancient Greek λανθάνω (lanthánō, “to escape notice, be hidden”),^[2][3][8] and is related to λήθη (lḗthē, “forgetfulness”), the source of Lethe and lethargy.^[4][8][9] Etymonline, after Watkins, traces it to Proto-Indo-European *lādh- (“to be hidden”).^[4]

Earliest recorded meaning

Hidden, concealed; present but not shown or developed: in a text of 1459 copied about 1475.^[2][3] Etymonline dates it to the mid-15th century, in the sense "concealed, secret".^[4]

Semantic evolution

Johnson (1755) gave "hidden; concealed; secret".^[10] From 1593 it could mean disguised, really but not obviously what a noun names, and since 1605, in Bacon, of a material thing, invisible to the naked eye.^[2] The medical sense, of a disease or infection present without symptoms, is recorded from 1665 in the OED,^[2] but only from 1684 in Barnhart.^[3] Science later gave it many technical uses: in botany for a dormant bud (1787), in electricity for a charge balanced by an opposite charge (1789), in photography for the invisible image formed by exposure to light (1841, Talbot), in forensic science for barely visible traces such as fingerprints (1892, Galton), and in statistics for a variable that cannot be directly measured (1937).^[2] A latent fingerprint has been called simply a latent since 1919 or 1920.^[11][2]

Timeline

• 1459 – hidden, concealed; present but not manifest.^[2][3]
• 1593 – disguised, secret.^[2]
• 1605 – of a material thing, invisible to the naked eye.^[2]
• 1665 – medicine, of a disease present without symptoms.^[2] Barnhart dates it to 1684.^[3]
• 1787 – botany, of a dormant bud.^[2]
• 1841 – photography, of an invisible image that can be developed.^[2]
• 1892 – forensic science, of a barely visible impression.^[2]
• 1919 – noun, a latent fingerprint.^[11] The OED's first record is from 1920.^[2]
• 1937 – statistics, of a variable that cannot be directly observed.^[2]

Meanings

Adjective

1. Present or potential but not yet visible, active or developed: Her latent talent for languages showed only when she moved abroad.^[12][11][2]
2. (medicine) Of a disease or infection: present but not yet producing symptoms.^[12][2]
3. (biology) Of a virus: inactive in the host cell, its genetic material being copied along with the cell's DNA.^[12]
4. (botany) Of a bud, spore or other part: dormant.^[12][2]
5. Of an image or a fingerprint: invisible or barely visible until developed or treated.^[2][11]

Noun

1. A fingerprint that is scarcely visible but can be developed for study; a latent print.^[11][2]

Word family

• latently
• latensification
• latency
• latent heat

Related words

• Lethe
• lethargy
• lanthanum

Usage notes

It is often contrasted with patent, open, evident.^[13][2]

References

1. ^ 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 s t u v w x Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
6. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
7. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
8. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
9. ^ Partridge, Eric (1966), Origins: A Short Etymological Dictionary of Modern English, 4th ed., London: Routledge & Kegan Paul
10. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
11. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
12. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins
13. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray