(historical) The French empire ruled by Napoleon III from 1852 to 1870.

A blood relative who shares roughly a quarter of a person's DNA, such as a grandparent, aunt, uncle, half-sibling, grandchild, niece, or nephew.

plural of second-degree relative

(law) an appellate court.

(science fiction, robotics) One of the Three Laws of Robotics, requiring a robot to obey humans, unless it would conflict with the First Law of Robotics (which forbids a robot to harm a human).

a rule of thumb by which a driver may maintain a safe following distance, allowing at least a two second interval behind any vehicle that is directly in front of the driver's vehicle.

(slang, US) A thief, especially one who climbs into buildings above ground level.

(informal) The belief that food dropped on the ground may safely be eaten provided it is picked up within five seconds of touching the ground.

plural of second-person singular

plural of second-person plural