Usage: The type of vernacular used by him is common for that type of education.
Usage: They were able to translate the vernacular of the foreign tourists into english.
Usage: The vernacular spoken in the little Italian Village was very different from the standard Italian you read in books.
Usage: This industry has its own vernacular.
All the definitions of for "vernacular" I've seen for this word in definition-of.com are pretty good, but I think "everyday language" encompasses everything. E.g., to old-time Catholic Americans, the vernacular for the Latin Mass was - in English; for Italians - in Italian; for Spaniards - in Spanish ... .
"Vernacular" sometimes verges on idiom, sometimes on informal usage, sometimes on slang or argot ... .
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