text: So messy!
  Indefectibility generally refers to the faith of the Church, a faith that cannot fail.
  Magisterium refers to teaching, which is expressed by bishops, especially the Pope and can appear in 2 forms, ordinary and extraordinary.
  Extraordinary teaching comes from bishops assembled in an ecumenical Council, or from the Pope ex cathedra. They may be considered as having been taught infallibly..
  Ordinary teachings can also be taught infallibly, by the Pope or by bishops not gathered in council.
  JP2’s statement about not ordaining women was NOT an act of his extraordinary magisterium, by his choice. However, it did testify to something that has been taught by the infallible ordinary teaching of all the bishops over the last 2 millennia.
  That is my summary of Ratzinger’s commentary on Ad Tuendam Fidei on these issues.