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cleavage

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The definition of cleavage is the act of breaking or dividing something into two, or the space between a woman's breasts when they are pushed together.

(noun)

An example of cleavage is the separation of oil from olives.
An example of cleavage is the area between the breasts of the models in the Victoria's Secret catalog.

See cleavage in Webster's New World College Dictionary

noun

a cleaving, splitting, or dividing
the manner in which a thing splits
a cleft; fissure; division
the hollow between a woman's breasts, as made visible by a low-cut neckline
Biol.
1. cell division, esp. the series of mitotic cell divisions that transform the fertilized ovum into the earliest embryonic stage
2. any single division in this series
Mineralogy the tendency of some minerals to break in definite planes, producing smooth surfaces

See cleavage in American Heritage Dictionary 4

noun

The act of splitting or cleaving.
The state of being split or cleft; a fissure or division.
Mineralogy The splitting or tendency to split of a crystallized substance along definite crystalline planes, yielding smooth surfaces.
Embryology
a. The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms. Also called segmentation.
b. Any single cell division in such a series.
Chemistry The splitting of a complex molecule, such as a polysaccharide, into simpler molecules.
Informal The hollow between a woman's breasts, especially as revealed by a low neckline.