Etymology
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vulgar (adj.)

late 14c., "common, ordinary," from Latin vulgaris, volgaris "of or pertaining to the common people, common, vulgar, low, mean," from vulgus "the common people, multitude, crowd, throng," perhaps from a PIE root *wel- "to crowd, throng" (source also of Sanskrit vargah "division, group," Greek eilein "to press, throng," Middle Breton gwal'ch "abundance," Welsh gwala "sufficiency, enough") [not in Watkins]. Meaning "coarse, low, ill-bred" is first recorded 1640s, probably from earlier use (with reference to people) with meaning "belonging to the ordinary class" (1530). Chaucer uses peplish for "vulgar, common, plebeian" (late 14c.). Related: Vulgarly.

What we have added to human depravity is again a thoroughly Roman quality, perhaps even a Roman invention: vulgarity. That word means the mind of the herd, and specifically the herd in the city, the gutter, and the tavern. [Guy Davenport, "Wheel Ruts"]

For Vulgar Latin, see here

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vulgarian (n.)
"rich person of vulgar manners," 1804, from vulgar (adj.) + -ian.
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vulgarize (v.)
"to make vulgar" (transitive), 1709, from vulgar + -ize. Related: Vulgarized; vulgarizing.
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vulgarity (n.)

1570s, "the common people," from French vulgarité and directly from Late Latin vulgaritas "the multitude," from vulgaris (see vulgar). Meaning "coarseness, crudeness" is recorded from 1774.

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Vulgate (n.)
Latin translation of the Bible, especially that completed in 405 by St. Jerome (c.340-420), c. 1600, from Medieval Latin Vulgata, from Late Latin vulgata "common, general, ordinary, popular" (in vulgata editio "popular edition"), from Latin vulgata, fem. past participle of vulgare "make common or public, spread among the multitude," from vulgus "the common people" (see vulgar). So called because the translations made the book accessible to the common people of ancient Rome.
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divulge (v.)

mid-15c., divulgen, "make public, send or scatter abroad" (now obsolete in this general sense), from Latin divulgare "publish, make common," from assimilated form of dis- "apart" (see dis-) + vulgare "make common property," from vulgus "common people" (see vulgar). Sense of "to tell or make known something formerly private or secret" is from c. 1600. Related: Divulged; divulging.

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vulgarisateur (n.)

1940, a French word brought into English by John Buchan (Baron Tweedsmuir) and picked up by philosopher C.E.M. Joad because they found no adequate word in English for one "who spreads with clarity, vividness, force and accuracy, the knowledge obtained by and the wisdom derived from others" [Joad, 1948], vulgarize already being in use in the pejorative sense; see vulgar.

It has been pre-eminently the age of the vulgarisateur in the best sense of that word. I think the tendency wholly admirable. Lord Rutherford used to say that no conclusion which he ever reached was of any use to him until he could put it into plain English, into language understood by the ordinary man. Attempts to present the history of the world as an interrelated intelligible process, or to give a bird's-eye view of the long march of the sciences, may be faulty in detail, with many arbitrary judgments, but they do furnish principles of interpretation which enable the reader to find at any rate one way in the world of thought—perhaps a little later to make his own way. In this task the vulgarisateur may be preparing the soil for a rich future harvest, just as the work of the Sophists cleared the ground for Plato. [John Buchan, "Memory Hold-the-Door," 1940]
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yer 
representing a dialectal or vulgar pronunciation of your, attested from 1814.
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buffoonery (n.)
"low jokes, vulgar pranks," 1620s; see buffoon + -ery.
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Sol (n.)
"the sun personified," mid-15c. (also in Old English), from Latin sol "the sun, sunlight," from PIE *s(e)wol-, variant of root *sawel- "the sun." French soleil (10c.) is from Vulgar Latin *soliculus, diminutive of sol; in Vulgar Latin diminutives had the full meaning of their principal words.
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