Skip to Content
Medical Term:

standard deviation


  1. statistical index of the degree of deviation from central tendency, namely, of the variability within a distribution; the square root of the average of the squared deviations from the mean.
  2. a measure of dispersion or variation used to describe a characteristic of a frequency distribution.
© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.