(fandom slang) The fictional universe which serves as the setting for the Vorkosigan Saga by Lois McMaster Bujold.

(Canada, US, film, informal) Any character who serves to provide exposition, such as explaining how an elaborate murder was committed, sparing the writers from having to convey it indirectly.

Buteo auguralis, a species of bird of prey in the Accipitridae family found in Africa

(uncountable) The quality of being unstable. / (physics, countable) A state that is not in equilibrium, or in which a small change has a large irreversible effect.