A situation in proofs where something is assumed as a premise that should itself be proved. In many cases, the conclusion trivially follows from the premises.

Example:

  Premise: Death should be prevented.
  Premise: Life always leads to death.
  Conclusion: Life should be prevented.
This assumes that death should be prevented, although this is not necessarily true. Death has its good points.

To prove that something is begging the question, prove that the premises may not be true. Or, prove that the premises depend on the conclusion.