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Full Definition of CLEAVAGE. 1. a: the quality of a crystallized substance or rock of splitting along definite planes; also: the occurrence of such splitting b: a fragment (as of a diamond) obtained by splitting. 2. : the action of cleaving: the state of being cleft. 3.
The first sign of cleavage is the appearance of the cleavage furrow, a shallow indentation in the cells surface. Simply, the cleavage furrow deepens and eventually pinches the parent cell into two, producing two completely separate daughter cells, each with its own nucleus and and share of cytoplasm.