The state of something being brilliant, normally used in conjunction with an idea.
"Hey man, how about instead of spending 6 hours at one Halloween party, we spend 2 hours at 3 different parties?!"

"That's brilliantness!"
by argyle09 November 12, 2009
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A term the British use to describe everything.
I's brilliant in't it? Right, yah, bloody brilliant. Wha' is? Oh, yah, right, brilliant. Bloody brillant.
by Lord Russell August 12, 2004
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A word which in the past meant that something was exceptionally good, or to express great pleasure:

Its strength has been eroded by overuse, and it can now be used to respond to any mildly pleasing news. Somehow the extreme unctuousness and insincerity of this tends to go unrecognized or is an occasion for the self-gratifying feeling that one is being tolerant.
In the olden days:

Smith-"Everyone has the day off tomorrow!"
Jones-"Brilliant!"

Nowadays:

Waiter: "Are you ready to order?"
Customer: "err, yes..."
Waiter: "Brilliant!!!"
by Pistefka September 24, 2009
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The word used by Arthur Shappey in John Finnemore's, Cabin Pressure to describe everything that isn't his father.
"Polar bears, are BRILLIANT"

Alternatively, in regards to Gordon Shappey:

Arthur: He's ah-- he's ahh-- he's alright.
Martin: Oh god he must be aweful!
by MissOkidoke October 09, 2012
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