1. • noun - a Roman Catholic system of casuistry that when expert opinions differ an actor can follow any solidly probable opinion that he wishes even though some different opinion might be more probable
   • noun - (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action
2. • The doctrine that probability is a sufficient basis for belief and action, since certainty in knowledge is unattainable.
   • The system of casuistry that, in those cases in which expert opinions on ethics are in doubt concerning the licitness of an act, allows an actor to follow the solidly probable opinion that favors the actor’s personal liberty even though an opposing opinion, favoring law, may be more probable.

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