cleavage

noun7

1. •
   The act of cleaving or the state of being cleft.
2. •
   The hollow or separation between a woman's breasts, especially as revealed by a low neckline.
3. •
   (informal) Any similar separation between two body parts, such as the buttocks or toes.
4. •
   The repeated division of a cell into daughter cells after mitosis.
5. •
   The splitting of a large molecule into smaller ones.
6. •
   The division of voters into voting blocs.
7. •
   The tendency of a crystal to split along specific planes; schistosity.