vulgar

adj

1. Debased; uncouth; distasteful; obscene.

   “vulgar language”

   “vulgar words”

   “a truly vulgar showing of affection”

   “vulgar and highly distressing scenes”

   “Also the rule of false position, with dyuers examples not onely vulgar, but some appertaynyng to the rule of Algeber.”

2. (derogatory, historical)Having to do with ordinary, common people.

   “Near-synonyms: vulgate; vulgarized”

   “It might be more useful to the English reader […] to write in our vulgar language.”

   “The mechanical process of multiplying books had brought the New Testament in the vulgar tongue within the reach of every class.”

   “Further, the same sacred name in other monuments precedes the vulgar name of King Takellothis, the sixth of the XXII. Dyn., as we have seen.”

3. (especially)Common, usual; of the typical kind.

   “vulgar bush brown (Bicyclus vulgaris)”

   “A vulture (V. aura), probably the Acabiry first described by Azara, is here called […] the hunter. It resembles in form the vulgar bird, but it flies high. The head is red, and the wings are black with silver lining, like the noble Bateleur of Africa.”

4. Being a vulgar fraction.

   “A fraction is vulgar if it has one integer divided by another integer, as long as the integer that's doing the dividing isn't equal to zero.”

noun

1. (derogatory, historical)A common, ordinary person.

   “Popular antiquarian writings […] frequently focused on the regional vulgars' superstitious beliefs regarding the dead and their ongoing presence—such as popular funeral rites or the vulgars' fear of church yards.”

2. (collective)The common people.
3. The language of a people, especially the commoners.

   “Therefore you Clowne, abandon: which is in the vulgar, leaue the societie: which in the boorish, is companie, of this female: which in the common, is woman: which together, is, abandon the society of this Female, […]”