UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/dɪˈfɛkʃən/US:USA pronunciation: respellingUSA pronunciation: respelling(di fekshən)

WordReference Random House Unabridged Dictionary of American English © 2020
de•fec•tion  (di fekshən),USA pronunciation n. 
  1. desertion from allegiance, loyalty, duty, or the like;
    apostasy:His defection to East Germany was regarded as treasonable.
  2. failure;
    loss:He was overcome by a sudden defection of courage.
  • Latin dēfectiōn- (stem of dēfectiō), equivalent. to dēfect(us) (see defect) + -iōn- -ion
  • 1535–45
    • 1.See corresponding entry in Unabridged loyalty.

Collins Concise English Dictionary © HarperCollins Publishers::
defection /dɪˈfɛkʃən/ n
  1. abandonment of duty, allegiance, principles, etc; backsliding
  2. another word for defect,
WordReference Random House Learner's Dictionary of American English © 2020
de•fect /n. ˈdifɛkt, dɪˈfɛkt; v. dɪˈfɛkt/USA pronunciation   n. [countable]
  1. a fault or shortcoming;
    imperfection:What defect in his character made him lie?

v. [no obj]
  1. to desert a cause, country, etc., and go over to the opponent's side:Would the spies want to defect to the West?
de•fec•tion, n. [uncountable]the defection of several members of the ambassador's staff.[countable]Defections increased during the crisis.See -fec-.

WordReference Random House Unabridged Dictionary of American English © 2020
de•fect  (n. dēfekt, di fekt;v. di fekt),USA pronunciation n. 
  1. a shortcoming, fault, or imperfection:a defect in an argument; a defect in a machine.
  2. lack or want, esp. of something essential to perfection or completeness;
    deficiency:a defect in hearing.
  3. CrystallographyAlso called  crystal defect, lattice defect. a discontinuity in the lattice of a crystal caused by missing or extra atoms or ions, or by dislocations.

  1. to desert a cause, country, etc., esp. in order to adopt another (often fol. by from or to):He defected from the U.S.S.R to the West.
de•fecti•ble, adj. 
de•fect′i•bili•ty, n. 
de•fectless, adj. 
  • Latin dēfectus failure, weakness, equivalent. to dēfec- variant stem of dēficere to run short, fail, weaken (see deficient) + -tus suffix of verb, verbal action
  • late Middle English 1375–1425
    • 1.See corresponding entry in Unabridged 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.).

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