DictionaryRoot: vulgaris
Latin
vulgaris
common; of the common people
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noun
vulgarity
vul-GAIR-uh-tee/vʌlˈɡærəti/
The quality or expression of being crude or lacking refinement.
Etymology
Latin vulgaris described what belonged to common people, a meaning that probably developed into the disparaging sense “unrefined.” Vulgarity came to name that coarseness, including tasteless or offensive acts and expressions.