adj. & n.
--adj.
1. abandoned, ownerless (esp. of a ship at sea or an empty decrepit property).
2 (esp. of property) ruined; dilapidated.
3 US negligent (of duty etc.).
--n.
1. a social outcast; a person without a home, a job, or property.
2 abandoned property, esp. a ship.
Etymology: L derelictus past part. of derelinquere (as DE-, relinquere leave)