Noun
English Wikipedia has an article on:semivarianceWikipedia
semivariance (plural semivariances)
(statistics) A measure of the dispersion of those values that fall below the mean or target value of a data set
However, Bachmaier and Backes (2008), who discussed this confusion, have shown that should be called a variogram, terms like semivariogram or semivariance should be avoided. Source: Internet
For skewed distributions, the semivariance can provide additional information that a variance does not. Source: Internet