1. The state of being variable, different, divergent, or deviate; a degree of deviation. 2. A measure of the variation shown by a set of observations, defined as the sum of squares of deviations from the mean, divided by the number of degrees of freedom in the set of observations.
- ball v. swelling and changes in shape and consistency of the ball in a ball-valve prosthesis, especially in one replacing the aortic valve.
* * *
n.
* * *
var·i·ance (varґe-əns) in statistics, a measure of the variation shown by a set of observations: the average of the squared deviations from the mean; it is the square of the standard deviation (q.v.). Symbol σ2>.Medical dictionary. 2011.