Definition of defect noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈdiːfekt//
; NAmE NAmE//ˈdiːfekt//
; BrE BrE//dɪˈfekt//
; NAmE NAmE//dɪˈfekt//
a fault in something or in the way it has been made which means that it is not perfect a speech defect a defect in the glass
Word Originnoun late Middle English (as a noun, influenced by Old French defect ‘deficiency’): from Latin defectus, past participle of deficere ‘desert or fail’, from de- (expressing reversal) + facere ‘do’.Extra examples Goods with slight defects are sold at half price. He has a congenital heart defect. The book contains serious defects. The builders agreed to remedy the structural defects. The child had a mild heart defect. The inspector found defects in the aircraft’s construction. The photograph shows slight defects due to age. There is evidence that air pollution can cause birth defects. This is a physical defect that cannot be cured. a defect of her character a fundamental defect in the product major defects in the education system A structural defect meant that the bridge could not be opened in time for the Millennium celebrations. Congenital defects occurred in 30% of babies born in areas where the weapons were used. Many people argue that the present system of voting has some serious defects. Over-breeding in pedigree dogs can cause major genetic defects in puppies. The drug is widely known to cause birth defects. The manufacturer is responsible for any defects that may cause damage. This product is no longer on sale because of a manufacturing defect. Vulnerable people are going short of money because of defects in the payment system.
See the Oxford Advanced American Dictionary entry: defect

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