What is probabiliorism?

Some articles on probabiliorism:

Catholic Probabilism - Probabiliorism
... Probabiliorism, which held that it is not lawful to act on the less safe opinion unless it is more probable than the safe opinion and which was in vogue before ... chapter of the Dominicans urged all members of the order to adopt Probabiliorism ... Gallican clergy, under Bossuet, accepted Probabiliorism ...