|Definition - The Latin spoken by the common people of the Roman Empire, especially from the second century CE on. It differed from Classical Latin in its vocabulary, grammar, and pronunciation.|
The Classical Latin word equus was replaced in common speech by the Vulgar Latin caballus, which was derived from Gaulish caballos. This evolved into the Modern French cheval, the Spanish caballo, and the English cavalry.
Etymology - The name derives from the Latin vulgaris, of or pertaining to the common people (from vulgus, the common people).
Note: The word Latin derives from the Latin Latinus, the adjectival form of the word Latium, the broad place, which was the name of the region of the Tiber river and the Alban hills in central Italy where Rome is located.