Aequiprobabilism, also spelled æquiprobabilism or equiprobabilism, is one of several systems in moral theology.
Æquiprobabilists say that in this Decree there is a clear expression of the mind of Innocent XI about the morality of teaching that it is permissible to act on the less safe opinion when the safe opinion is certainly more probable.
The pope disapproves of this teaching, commends Father Gonzalez for his opposition to it, and orders the General of the Jesuits to allow full liberty so that anyone who pleases may write against it.
Probabilists reply that, though Innocent XI was opposed to Probabilism, his official Decree merely commanded that liberty of teaching be allowed to the members of the order.
Moreover, they point out that Gonzalez was not an Æquiprobabilist, but a Probabiliorist of a strict type whom St. Alphonsus Liguori regarded as an extremist.