deficient

Etymology

It is borrowed from Latin dēficiēns (“failing, lacking”), the present participle of dēficiō (“to fail, be wanting; originally to undo, leave, forsake”),^{[2][3][4][5][6][7]} formed from dē- (“down, away”) and faciō (“to make, do”),^{[2][3][8][9][10]} from Proto-Indo-European *dhe- (“to set, put”).^[3] The same Latin verb gave defect, from its past participle, and deficit, from its third person singular "it is lacking";^[8][9] a parallel formation lies behind defeat.^[8] French déficient is recorded later, from 1754.^[2]

Earliest recorded meaning

In the theological phrase deficient cause, a failure or absence that brings about some result: 1581, in J. Bell's translation of W. Haddon and J. Foxe.^[2][11][7] Merriam-Webster and Barnhart also date the word to 1581.^[10][5]

Semantic evolution

The theological use, contrasted with efficient cause, lasted until the late 17th century.^[7][2] The main modern sense, lacking some element needed for completeness, appears in Shakespeare's Othello (before 1616),^[2] and "present in less than the proper amount, insufficient" in 1632;^[2] Etymonline dates "not having an adequate supply" to about 1600.^[3] Shakespeare also used it in King Lear (1608) for "failing, fainting", a sense that died out by 1632.^[2] Chambers's Cyclopædia of 1728 introduced technical uses such as deficient number, a number whose factors add up to less than itself.^[2] Johnson (1755) defined the adjective as "failing; wanting; defective; imperfect", with a quotation from Paradise Lost.^[12] As a noun it meant a deficiency (1640–86) and a defaulter (1697–1719), and since 1906 a person with a physical or intellectual disability, a use now offensive.^[2][10] In Gloucestershire in deficient of meant "instead of".^[13]

Timeline

• 1581 – deficient cause, in theology (obsolete).^[2][7]
• 1608 – failing, fainting, in Shakespeare's King Lear (obsolete).^[2]
• before 1616 – lacking something needed for completeness, in Shakespeare's Othello.^[2]
• 1632 – insufficient in amount, inadequate.^[2]
• 1640 – noun, a deficiency (obsolete).^[2]
• 1728 – deficient number, in arithmetic.^[2]
• 1906 – noun, a person with a disability.^[2][10]

Meanings

Adjective

1. Lacking some necessary quality or element; incomplete or defective: a soil deficient in nitrogen.^[14][10][2]
2. Not enough in amount; insufficient or inadequate.^[14][2]
3. Below the normal standard.^[10]
4. (mathematics) Of a number, having factors whose sum is less than the number itself.^[2]

Noun

1. (offensive) A person with a physical or intellectual disability.^[10][2]

Word family

• deficiently
• nondeficient
• deficient number

Related words

• defect
• defection
• defective
• defector
• deficiency
• deficit
• efficient
• defeat
• fact

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 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ a b Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
6. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
7. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
8. ^ a b c Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
9. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
10. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
11. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
12. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
13. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
14. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins