normal distribution

noun Statistics.
a theoretical frequency distribution represented by a normal curve.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
normal distribution
statistics Also called: Gaussian distribution a continuous distribution of a random variable with its mean, median, and mode equal, the probability density function of which is given by (exp-[(x--μ)²/2σ²]/σ√(2π)) where μ is the mean and σ² the variance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
normal distribution   (nôr'məl)  Pronunciation Key 
A theoretical frequency distribution for a set of variable data, usually represented by a bell-shaped curve symmetrical about the mean.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

normal distribution definition

(Or "Gaussian distribution") The frequency distribution of many natural phenomena such as the height or intelligence of people of a certain age and sex. The formula looks something like:
P(x) = e^(((x-m)/s)^2)
where P(x) is the probability of a measurement x, m is the mean value of x and s is the standard deviation.
Also known as a "bell curve" because of its shape.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Innovations to this process are drawn randomly each period from a normal
But he had problems fitting people's heights and weights in a population into
  such a normal distribution.
Kurtosis is a measure of whether the data are peaked or flat relative to a
  normal distribution.
In all cases, the chi-square test was applied to test for a normal distribution.
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