Willful neglect of one's duty. / The act of abandoning something, or the state of being abandoned. / Land gained from the water by a change of water-line.

plural of dereliction

Property abandoned by its former owner, especially a ship abandoned at sea. / (dated) An abandoned or forsaken person; an outcast.

Abandoned, forsaken; given up by the natural owner or guardian; (of a ship) abandoned at sea, dilapidated, neglected; (of a spacecraft) abandoned in outer space. / Negligent in performing a duty.

plural of derelict

The quality of being derelict.