Induction of a particular tissue produced by the action of an evocator during embryogenesis. [L. evoco, pp. evocatus, to call forth, evoke]
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evo·ca·tion .ē-vō-'kā-shən, .ev-ə- n INDUCTION (3b) specif initiation of development of a primary embryonic axis
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evo·ca·tion (ev″o-kaґshən) [L. e out + vocare to call] the calling forth of morphogenetic potentialities through contact with organizer material.Medical dictionary. 2011.