deliberate or conscious neglect; negligence; delinquency: dereliction of duty.
the act of abandoning something.
the state of being abandoned.
Law. a leaving dry of land by recession of the water line.

1590–1600; < Latin dērelictiōn- (stem of dērelictiō) an abandoning, equivalent to dērelict(us) (see derelict) + -iōn- -ion

1. See neglect. 2. desertion. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dereliction (ˌdɛrɪˈlɪkʃən)
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.  law
 a.  accretion of dry land gained by the gradual receding of the sea or by a river changing its course
 b.  the land thus left

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1590s, "abandonment" (formerly with a wider range than in modern use, e.g. of the sea withdrawing from the land), from L. derelictionem, noun of action from derelinquere (see derelict). Meaning "failure in duty" is from c.1830.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He is charged with dereliction of duty and failure to comply with regulations.
Post-tenure review would mean that tenure, though guaranteeing academic freedom, no longer protects gross dereliction.
Dereliction of this duty should be dealt with in a similar manner as a drunk driving offense.
To sit at the executive table and neither to know nor to inquire about deals involving billions of dollars is dereliction of duty.
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