a rule assuming as true something that is clearly false. A fiction is often used to get around the provisions of constitutions and legal codes that legislators are hesitant to change or to encumber with specific limitations. Thus, when a legislature has no legal power to sit beyond a certain midnight but has five hours more of work still to do, it is easier to turn back the official clock from time to time than it is to change the law or constitution.

In ancient Rome, where every family needed a male heir, the lack of one was overcome through the legal fiction of adoption. In England, when courts handling civil cases were full, the Court of Queen's (or King's) Bench, a criminal court, could take some of the load by pretending that the defendant in a simple civil suit had been arrested and was in custody.

Almost any legal fiction can be stated in terms of fact. Thus, the fiction that a corporation is, for many purposes, a person separate from its members is equivalent to saying that, for those purposes, the law deals with the group as a unit, disregarding for the moment the group's individual members as such.