defect
Americannoun
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defects
plural
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a shortcoming, fault, or imperfection: a defect in a machine.
a defect in an argument;
a defect in a machine.
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lack or want, especially of something essential to perfection or completeness; deficiency: a defect of action.
a defect of common sense
a defect of action.
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Also called lattice defect, crystal defect. Crystallography. a discontinuity in the lattice of a crystal caused by missing or extra atoms or ions, or by dislocations.
verb (used without object)
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defects,
present (3rd person singular)
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defected,
past participle, past
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defecting
present participle
noun
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a lack of something necessary for completeness or perfection; shortcoming; deficiency
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an imperfection, failing, or blemish
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crystallog a local deviation from regularity in the crystal lattice of a solid See also point defect dislocation
verb
Synonym Usage
Defect, blemish, flaw refer to faults that detract from perfection. Defect is the general word for any kind of shortcoming or imperfection, whether literal or figurative: a defect in eyesight, in a plan. A blemish is usually a defect on a surface, which mars the appearance: a blemish on her cheek. Flaw is applied to a defect in quality, caused by imperfect structure (as in a diamond) or brought about during manufacture (as in texture of cloth, in clearness of glass, etc.).
Other Word Forms
Derived Forms
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defectibilitynoun
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defectornoun
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predefectnoun
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redefectverb (used without object)
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defectibleadjective
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defectlessadjective
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nondefectingadjective
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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defectsimple
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defectssimple
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have defectedperfect
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has defectedperfect
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am defectingprogressive
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are defectingprogressive
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is defectingprogressive
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have been defectingperfect progressive
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has been defectingperfect progressive
Past
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defectedsimple
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had defectedperfect
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was defectingprogressive
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were defectingprogressive
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had been defectingperfect progressive
Future
Etymology
Origin of defect
First recorded in 1375–1425; late Middle English, from Latin dēfectus “failure, weakness,” equivalent to dēfec-, variant stem of dēficere “to run short, fail, weaken” ( see deficient) + -tus suffix of verb action
Explanation
A flaw in something is a defect. At certain stores you can buy clothes with slight defects. You have to be careful because the defect can be minor, like a missing button, or major, like sleeves of uneven lengths. In a person, a defect is an imperfection, which can manifest itself mentally or physically. If you are diagnosed with a heart defect, you will have to seek the advice of specialists. A hearing defect might leave your dad deaf in one ear. If you are becoming forgetful, you can joke that you are developing a mental defect, but if it continues, you'll probably want to have your head examined.
Vocabulary lists containing defect
Tuesdays with Morrie
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The Glass Menagerie
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Thomas Jefferson's First Inaugural Address (1801)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
To test their approach, the researchers first examined a nitrogen-vacancy center in diamond, a type of crystal defect widely studied for quantum applications.
From Science Daily ● Oct. 23, 2026
Under Seoul's constitution, all North Koreans are considered citizens of the Republic of Korea, as the South is officially known, and those who reach its territory and seek to defect are generally allowed to stay.
From Barron's ● Oct. 20, 2026
Both indictments were later dismissed because of a defect involving the appointment of the prosecutor, although the Justice Department subsequently pursued a new indictment against Comey.
From Salon ● Oct. 17, 2026
The law firm claimed he “struck a defect in the roadway causing him to fall.”
From The Wall Street Journal ● Oct. 6, 2026
A mental excess had produced in Helmholtz Watson effects very similar to those which, in Bernard Marx, were the result of a physical defect.
From "Brave New World" by Aldous Huxley
These earlier observations helped researchers recognize that antibodies blocking IL-10 could produce effects similar to inherited defects involving the same protein or its receptor.
From Science Daily ● Oct. 26, 2026
As long as they adhere to price caps, agree to certain labor requirements and fix repairs that arise, they’re protected from lawsuits from buyers concerning defects 10 years after construction of the home.
From Los Angeles Times ● Oct. 24, 2026
Meanwhile, the scientists are expanding their approach to investigate spin defects in silicon, as well as materials used in energy technologies where internal conversion influences how energy is transferred or lost.
From Science Daily ● Oct. 23, 2026
While it doesn’t offer insurance, all jewelry does come with a warranty that covers “imperfections that are the result of defects in the manufacturing process.”
From MarketWatch ● Oct. 22, 2026
Wiener has proposed, on intuitive grounds, that defects and misinterpretations in such a communication system may be an unexplored territory for psychiatry.
From "The Lives of a Cell" by Lewis Thomas
Several lawmakers from across the political spectrum have defected to the Liberals in the past year.
From The Wall Street Journal ● Sep. 30, 2026
Laura Anne Jones is a former Conservative who defected to Reform in the summer of 2025.
From BBC ● Sep. 22, 2026
Montgomerie defected from the Tories 18 months ago but was suspended from Reform UK last month after he criticised senior figures.
From BBC ● Sep. 8, 2026
Kendall had been a key backer of Democrat Andrew Jackson in the 1828 election, having defected from Henry Clay’s Whigs.
From Slate ● Sep. 4, 2026
Later, Celia would learn with sadness that the girl had defected while on tour in Oaxaca and was playing a psychotic housewife on a popular Mexican novela.
From "Dreaming in Cuban" by Cristina García
Last year was a low point for the video game juggernaut, with poor reviews for its single-player campaign mode and multiplayer fans defecting to rival titles.
From BBC ● Oct. 22, 2026
Despite leaving, Tugay did not follow Ozel, saying he would remain independent, with rumours emerging over the summer that he was considering defecting to AKP -- all of which he denied.
From Barron's ● Oct. 7, 2026
At the dinner, I tried to get a sense if there were more women like Smith—sweet, older Christian Alabamians—snapping and defecting to the left.
From Slate ● May 4, 2026
Jaber Rajabi, who served in the Revolutionary Guard and studied with Khamenei in a religious seminary in Qom before defecting in 2016, warned Iran’s Arab neighbors about him before his elevation.
From The Wall Street Journal ● Apr. 15, 2026
Common sense told him that telling lies and defecting from duty were sins.
From "Catch-22" by Joseph Heller
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