Word of the Day - Dereliction May 24, 2011 der·e·lic·tion [der-uh-lik-shuhn] –noun 1.deliberate or conscious neglect; negligence; delinquency: dereliction of duty. 2.the act of abandoning something. 3.the state of being abandoned. 4.Law . a leaving dry of land by recession of the water line.