(computing) A security scheme for file-level security (as opposed to traditional user, group levels, or the somewhat stricter role levels). Abbreviated ACL.

(law) A person who assists or protects someone wanted by the police in connection with a crime.

(physics) A device in which a drive beam (either laser or particle) produces a plasma wave ("wakefield") that accelerates charged particles in a relatively short distance.

The practice of restricting entrance to a property, a building, or a room to authorized persons. / In technology, permitting or denying the use of a particular resource.

(perspective) A point on the horizon at which two parallel lines appear to meet.

An incident, especially one that is harmful, occurring under highly unusual and unlikely circumstances.

(UK) A region of a highway where there has been several accidents in the past; especially one with signage to make drivers aware.

(law) To receive and acknowledge receipt of service of process.

An aviation accident where the damage to the aircraft is such that it must be written off, or in which the aircraft is totally destroyed.

plural of acceleration clause