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1. Literally, of, referring, or belonging to Belgravia, a wealthy district in central London. Primarily heard in UK. Those Belgravian apartments will always be far above our means, but they are lovely to dream about anyway.
2. By extension, highly fashionable, elite, or belonging to an aristocratic lifestyle. Primarily heard in UK. Oh please, you live such a Belgravian life. You wouldn't know what it means to work for a living.