Definition of matter of law in English:

matter of law

noun

Law
  • The part of a judicial inquiry concerned with the interpretation of the law.

    Often contrasted with matter of fact
    • ‘That issue is to be determined in the context of the function of a coroner's inquest, which is a matter of law.’
    • ‘One reason is if the judge concludes, as a matter of law, that the defendant owed no duty to the plaintiff.’
    • ‘It is not required as a matter of law for a conviction to be sustained.’
    • ‘First, the court must decide whether it can, as a matter of law, assume jurisdiction.’
    • ‘It is submitted there can be no criticism as a matter of law of that decision.’