2. Someone who has somekind of superior memory.
3. Although term is very subjective but cognitive sciences define genius "sheerly brilliant" or someone who comes close to being an obsessive compulsive but have very fine control over his/her abilities.
4. Quantitatively someone with an IQ higher than 140.
To name few.
Also, something that is brilliant, and temporarily eludes description due to it's awesomeness.
I is teh genie arse.
Some qoutes I'd like to share (by that, I mean a pasted them from another site)
* Henri-Frédéric Amiel
Geniuses are the luckiest of mortals because what they must do is the same as what they most want to do.
* W. H. Auden
Since when was genius found respectable?
* Elizabeth Barrett Browning
Few people can see genius in someone who has offended them.
* Robertson Davies
Genius always finds itself a century too early.
* Ralph Waldo Emerson
In every work of genius we recognize our own rejected thoughts: they come back to us with a certain alienated majesty.
* Ralph Waldo Emerson
Genius goes around the world in its youth incessantly apologizing for having large feet. What wonder that later in life it should be inclined to raise those feet too swiftly to fools and bores.
* F. Scott Fitzgerald
The world is always ready to receive talent with open arms. Very often it does not know what to do with genius.
* Oliver Wendell Holmes
Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.
* Georg Christoph Lichtenberg
Towering genius disdains a beaten path. It seeks regions hitherto unexplored.
* Abraham Lincoln
Genius does what it must, and Talent does what it can.
* Owen Meredith
Better beware of notions like genius and inspiration; they are a sort of magic wand and should be used sparingly by anybody who wants to see things clearly.
* José Ortega y Gasset
Every positive value has its price in negative terms...The genius of Einstein leads to Hiroshima.
* Pablo Picasso
One science only will one genius fit:
So vast is art, so narrow human wit.
* Alexander Pope
We should like to have some towering geniuses, to reveal us to ourselves in colour and fire, but of course they would have to fit into the pattern of our society and be able to take orders from sound administrative types.
* J.B. Priestley
When a true genius appears in the world, you may know him by this sign, that the dunces are all in confederacy against him.
* Jonathan Swift
I put all my genius into my life; I put only my talent into my works.
* Oscar Wilde
Masterpieces are not single and solitary births; they are the outcome of many years of thinking in common, of thinking by the body of the people, so that the experience of the mass is behind the single voice.
* Virginia Woolf