(linguistics) A control verb whose shared object is not the subject.

(astronomy) a type of active galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae

A proposed alternative to a black hole whose collapse continually slows down, and that does not form an event horizon

(astronomy) A star that contains a core made from another star. It is formed when a neutron star collides with a star, typically a red giant or supergiant, and the neutron star is swallowed by the red giant star.

(software) An individual database in the versioning software ClearCase.

(computing) An object in programming that provides an abstract interface to some type of persistence mechanism, providing some specific data operations without exposing details of the persistence layer.

(programming, languages) An entity of which the value can neither be passed as a parameter, nor be returned from a function, nor assigned to a variable. (Used by Raphael Finkel, the first-class object does not need to have run-time constructability according to his definition.)

(programming, languages) An entity of which the value can be passed as a parameter, but that can neither be returned from a function, nor be assigned to a variable. (Used by Raphael Finkel, the first-class object does not need to have run-time constructability according to his definition.)

(programming, languages) An entity that can be constructed at run-time, passed as a parameter, returned from a function, or assigned into a variable.

(architecture, computing, design) A behavioural design pattern that describes the uses of null objects and their behavior (or the lack of them).