What is the meaning of common?

noun

• A piece of open land for recreational use in an urban area.
  • usage: "they went for a walk in the park"
  • synonyms: park, commons, green

adjective

• Belonging to or participated in by a community as a whole; public.
  • usage: "for the common good"; "common lands are set aside for use by all members of a community"
• Having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual.
  • usage: "the common man"; "a common sailor"; "the common cold"; "a common nuisance"; "followed common procedure"; "it is common knowledge that she lives alone"; "the common housefly"; "a common brand of soap"
• Common to or shared by two or more parties.
  • usage: "a common friend"; "the mutual interests of management and labor"
  • synonyms: mutual
• Commonly encountered.
  • usage: "a common (or familiar) complaint"; "the usual greeting"
  • synonyms: usual
• Being or characteristic of or appropriate to everyday language.
  • usage: "common parlance"; "a vernacular term"; "vernacular speakers"; "the vulgar tongue of the masses"; "the technical and vulgar names for an animal species"
  • synonyms: vernacular, vulgar
• Of or associated with the great masses of people.
  • usage: "the common people in those days suffered greatly"; "behavior that branded him as common"; "his square plebeian nose"; "a vulgar and objectionable person"; "the unwashed masses"
  • synonyms: plebeian, vulgar, unwashed
• Of low or inferior quality or value.
  • usage: "of what coarse metal ye are molded- Shakespeare; "produced... The common cloths used by the poorer population"
  • synonyms: coarse
• Lacking refinement or cultivation or taste.
  • usage: "he had coarse manners but a first-rate mind"; "behavior that branded him as common"; "an untutored and uncouth human being"; "an uncouth soldier-a real tough guy"; "appealing to the vulgar taste for violence"; "the vulgar display of the newly rich"
  • synonyms: coarse, rough-cut, uncouth, vulgar
• To be expected; standard.
  • usage: "common decency"