UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌdɛrɪˈlɪkʃən/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˌdɛrəˈlɪkʃən/ ,USA pronunciation: respelling(der′ə likshən)

WordReference Random House Learner's Dictionary of American English © 2020
der•e•lic•tion /ˌdɛrəˈlɪkʃən/USA pronunciation   n. [uncountable]
  1. deliberate neglect;
    delinquency:dereliction of duty.

WordReference Random House Unabridged Dictionary of American English © 2020
der•e•lic•tion  (der′ə likshən),USA pronunciation n. 
  1. deliberate or conscious neglect;
    delinquency:dereliction of duty.
  2. the act of abandoning something.
  3. the state of being abandoned.
  4. Lawa leaving dry of land by recession of the water line.
  • Latin dērelictiōn- (stem of dērelictiō) an abandoning, equivalent. to dērelict(us) (see derelict) + -iōn- -ion
  • 1590–1600
    • 1.See corresponding entry in Unabridged See  neglect. 
    • 2.See corresponding entry in Unabridged desertion.

Collins Concise English Dictionary © HarperCollins Publishers::
dereliction /ˌdɛrɪˈlɪkʃən/ n
  1. deliberate, conscious, or wilful neglect (esp in the phrase dereliction of duty)
  2. the act of abandoning or deserting or the state of being abandoned or deserted
  3. accretion of dry land gained by the gradual receding of the sea or by a river changing its course
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