left or deserted, as by the owner or guardian; abandoned: a derelict ship.
neglectful of duty; delinquent; negligent.
a person abandoned by society, especially a person without a permanent home and means of support; vagrant; bum.
Nautical. a vessel abandoned in open water by its crew without any hope or intention of returning.
personal property abandoned or thrown away by the owner.
one guilty of neglect of duty.
Law. land left dry by a change of the water line.

1640–50; < Latin dērelictus forsaken (past participle of dērelinquere), equivalent to dē- de- + relictus past participle of relinquere to leave, abandon; see relinquish

derelictly, adverb
derelictness, noun
nonderelict, adjective, noun

2. remiss, careless, heedless. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
derelict (ˈdɛrɪlɪkt)
1.  deserted or abandoned, as by an owner, occupant, etc
2.  falling into ruins; neglected; dilapidated
3.  neglectful of duty or obligation; remiss
4.  a person abandoned or neglected by society; a social outcast or vagrant
5.  property deserted or abandoned by an owner, occupant, etc
6.  a vessel abandoned at sea
7.  a person who is neglectful of duty or obligation
[C17: from Latin dērelictus forsaken, from dērelinquere to abandon, from de- + relinquere to leave]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from L. derelictus, pp. of dereliquere "abandon," from de- "entirely" + relinquere "leave behind" (see relinquish). Originally especially of vessels abandoned at sea or stranded on shore.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ten years ago the original village was becoming a ghost town of derelict
  buildings and deserted dirt roads.
Either way, they are derelict in their duty.
The city centre, much of which has lain derelict for a decade or more, is alive
  with construction activity.
They have to ask for the subpoena, or they would be derelict in their duty.
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