Noun
a disputed legal contention that is generally left for a judge to decide
Source: WordNetThe courts have jurisdiction to rule on the constitutionality of statutes, both in disputes before them and on a reference where there is no dispute but only an abstract question of law. Source: Internet
To satisfy commonality, there must be a common question of law and fact such that "determination of its truth or falsity will resolve an issue that is central to the validity of each one of the claims in one stroke." Source: Internet