What does the word null mean?

Usage examples for null

  1. For if it can be shown that such a state of things does not really exist, then our inference to the kind of cause requisite to account for it is necessarily null. – A Candid Examination of Theism by George John Romanes
  2. Then you institute laws, and substitute custom to make them null. – Our World, or, The Slaveholders Daughter by F. Colburn Adams