What does the word conjecture mean?

Usage examples for conjecture

  1. What Wayne and his horsemen are doing nobody can even conjecture. – The Napoleon of Notting Hill by Gilbert K. Chesterton
  2. He could not even conjecture how the interrupted sentence on the third page ought to end. – Dawn of All by Robert Hugh Benson
  3. It is impossible even to conjecture what may or may not be so considered by the Senate. – Complete State of the Union Addresses from 1790 to the Present by Various