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I could be wrong, but I've only ever lived here in Santa Barbara, California, and I don't think 'brilliant' in the sense of #s 4 and/or 5 are dated here in the US.. Example sentence... "You've done a brilliant job!" - I could be mistaken but I think people still say that here... Tehmikuji (talk) 12:53, 24 August 2012 (UTC)

Thanks. I (NYC) think you are correct and checked “brilliant” at OneLook Dictionary Search. I have amended the entry accordingly. These senses seem to have more overlap than most, too.
I have heard brilliant used more often by UK speakers with a non-specific positive meaning, for example, in reaction to something liked. Perhaps a UK speaker can add to or amend the entry to reflect the usage. DCDuring TALK 13:45, 24 August 2012 (UTC)