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 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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Merriam-Webster unabridged
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