1. A type of issue decided by applying legal rules to facts that are not in flux. The facts should either be uncontested, legally certain, or already decided by a trier of fact. This type of issue is always reserved to judges, and never given to juries.
2. An issue that turns on a factual point, but has been reserved to judges and deliberately kept away from juries in the law of a jurisdiction that governs a dispute. This type of issue may reasonably appear to involve significant question of fact, but has nevertheless been held by mandatory authority to be a question of law as described in definition (1) above.
3. An issue of which legal rule should be chosen from a set of mutually exclusive legal rules that might be used to resolve a dispute. This type of issue is reserved to judges, and never given to juries.
See Question of fact (contrast).