Belgravian Meaning

(idiomatic) Of or pertaining to the fashionable or aristocratic life; fashionable, aristocratic.

Example: Of or pertaining to Belgravia, London.
1909, The Athenæum: A Journal of Literature, Science, The Fine Arts, Music, and The Drama, page 434,
  Many of the social figures in England, male and female, especially a very Belgravian mother, Lady Clarice, are deftly drawn ; but the coloured desperado, who fails in his attack on his brother, is a little crude.
1929, Punch, or the London Charivari, Volume 176, page 258,
  […] and of course she has the most Belgravian connection, my dear she's ushered half the peerage onto the planet, so that what I don't know about the insides of the aristocracy and their habits in the home, […]