derelictionсуществительное The state of having been abandoned and become dilapidated. The old factory fell into dereliction after the company went bankrupt.
The shameful failure to fulfill one's obligations. The officer was charged with dereliction of duty for not reporting the incident.
The intentional abandonment of property, especially land or a vessel, or the permanent recession of water that leaves formerly submerged land exposed. The gradual dereliction of the shoreline created new stretches of beach.