distribution /dis·tri·bu·tion/ (dis″trĭ-bu´shun)
1. the specific location or arrangement of continuing or successive objects or events in space or time.
2. the extent of a ramifying structure such as an artery or nerve and its branches.
3. the geographical range of an organism or disease.
chi-square distribution a distribution of sample differences using observations of a random sample drawn from a normal population.
normal distribution a continuous probability density function roughly characterizing a random variable that is the sum of a large number of independent random events; usually represented by a smooth bell-shaped curve symmetric about the mean. 
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Normal distribution. The approximate percentage of the area (or frequency) lying under the curve between standard deviations is indicated.
chi-square distribution
in statistical terms this is said of a variable with K degrees of freedom if it is distributed like the sum of the squares of K independent random variables each of which has a normal distribution with mean zero and variance of 1.
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