Cleavage

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Cleavage in general refers to a division or separation of form. Its usage is heavily dependent on cultural context, where it may refer to:

Cleavage (breasts), partial exposure of the separation between a woman's breasts.
Cleavage (buttocks), partial exposure of buttock cheeks, particularly when visible because of low trousers.
Cleavage (embryo), in embryology, is the division of cells in the early embryo.
Cleavage (crystal), in mineralogy and materials science, is a process of splitting a single crystal.
Cleavage (fiber), in optical fibers.
Bond cleavage, in chemistry, is the breaking of a chemical bond in a chemical reaction.
Teeth cleavage, or Tooth cleavage, slang, is the gap between a persons two front teeth.
Political cleavage, or the ethnic, cultural, racial, economic and/or social identities along which a society can be politically divided.