Definition of cleavage
1a : 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 or splitting : the state of being cleft
3 : the series of synchronized mitotic cell divisions of a fertilized egg that results in the formation of the blastomeres and changes the single-celled zygote into a multicellular embryo also : one of these cell divisions
4 : the splitting of a molecule into simpler molecules
5 : the depression between a woman's breasts especially when made visible by a low-cut neckline
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Time Traveler for cleavage
The first known use of cleavage was in 1816
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