Meaning of ANISOTROPY in English
[General] characteristic of variance along different directions
[GIS] It is because the directional difference that the semivariogram values of two pairs of points which have the same distance are not identical, the directional influence is known as anisotropy.
Note: Anisotropy differs from the global trend because the global trend can be described by a physical process(eg. the prevailing winds) and modeled by a mathematical formula. The cause of the anisotropy(directional influence) in the semivariogram is not usually known, so it is modeled as random error.
Sean Woo's Finance, GIS and real estate English glossary. Английский глоссарий по ГИС(Географическая информационная система) и недвижимости Sean Woo's Finance. 2012