Webster's Revised Unabridged Dictionary · 1913

Dereliction

Dereliction , noun

[Latin derelictio.]

1.
The act of leaving with an intention not to reclaim or resume; an utter forsaking abandonment.
Cession or dereliction, actual or tacit, of other powers. — Burke
2.
A neglect or omission as if by willful abandonment.
A total dereliction of military duties. — Sir W. Scott
3.
The state of being left or abandoned.
4.
(Law) A retiring of the sea, occasioning a change of high-water mark, whereby land is gained.