I had not heard the word used according to definition given. but my dictionary
divulged that as the second definition.

I, also, had not heard the term in any other than the third definition. Vulgar Latin, on the other hand, as the common language of the citizens, I had heard. And the more I hear about it the more it seems a language different from the language of oratory, rhetoric and learned writing, not just in usage and preciseness, but in basic grammar.

and guess what? although rare, it has been verbed: to put into general circulation.

"Amongst the untruths.. few are more detrimental to truth than the epithets vulgated upon Sovereigns." -Sir Francis Palgrave, 1851