Top Definition
Society for persons posessing intelligence quotients at least four full standard deviations above the mean. This means they are smarter than 99.997% of the population, and have an IQ of 164. But they are still dumber than the Six Nines Society, where you have to be smarter than 99.9999%, or one out of a million, meaning in a world of six billion, there are six thousand of them, and about 1,500 in China.
You have to be a mensan just to figure out what the hell a four sigma society memeber is!
by danw December 22, 2003

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