cleavage

noun

1. 1

   the act of cleaving or splitting

2. 2

   the line formed by a groove between two parts (especially the separation between a woman's breasts)

3. 3

   (embryology) the repeated division of a fertilised ovum

4. 4

   the breaking of a chemical bond in a molecule resulting in smaller molecules

5. 5

   the state of being split or cleft

   there was a cleavage between the liberal and conservative members