1590s, "abandonment" (formerly with a wider range than in modern use, such as of the sea withdrawing from the land), from Latin derelictionem (nominative derelictio), noun of action from past participle stem of derelinquere (see derelict). Meaning "failure in duty" is from c. 1830.
1. He pleaded guilty to wilful dereliction of duty.
2. The previous owners had rescued the building from dereliction.
3. The law clearly stipulates criminal sanctions for any prison staff guilty of dereliction of duty.
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4. He was found guilty of gross dereliction of duty.
5. This policeman was punished for his dereliction of duty.