[Campion]

That is a significant difference from the "normal" meaning of the word.

Actually, it isn't. Check the dictionary.

That aside, working with the novel definition, what about Vatican II?

What about it?

[FactQuest]

Me: That is a significant difference from the "normal" meaning of the word.

You:Actually, it isn't. Check the dictionary.

From dictionary.com...

in·fal·li·ble ( P ) Pronunciation Key (n-fl-bl) adj.
1. Incapable of erring: an infallible guide; an infallible source of information.
2. Incapable of failing; certain: an infallible antidote; an infallible rule.
3. Roman Catholic Church. Incapable of error in expounding doctrine on faith or morals.

Notice how the first definition, i.e., the most common definition, means without erring. Notice how the third and last definition, and one that is clearly specified to mean the RCC's own special defintion, is the only one that means what you say it means. I rest my case.

Me: That aside, working with the novel definition, what about Vatican II?

You: What about it?

Are you just trying to be obtuse? The "what about it" I went into in post #7. I'll admit to plenty of ignorance, but surely, Vatican II was ex-cathedra, no?