variance

## variance

(va^r' E *u*ns) *n.*

1. a difference from the usual or expected.

2. *Statistics.* a measure of the dispersion of a probability distribution, the mean of the square of the difference from the mean.

3. *Quality.* *a.* the tendency of the results of a process to vary. *b.* the failure of a product to meet a particular specification. *c.* the difference between the actual and acceptable values of a measure. *d.* the relative frequency of failure in a process.