zonation noun. [zǝʊ'neɪʃ(ǝ)n] L19.
[from ZONE noun + -ATION.]
Distribution in zones or regions of definite character; spec. (a) Ecology the distribution of plants or animals into specific zones according to altitude, depth, etc., each characterized by its dominant species; (b) Cytology formation of zones in the cytoplasm during mitotic division of some oocytes.

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