cleavage in WordNet English dictionary

1. the act of cleaving or splitting
   cleavage 
   
2. the line formed by a groove between two parts (especially the separation between a woman's breasts)
   cleavage 
   
3. (embryology) the repeated division of a fertilised ovum
   cleavage  segmentation 
   
4. the breaking of a chemical bond in a molecule resulting in smaller molecules
   cleavage 
   
5. the state of being split or cleft
   "there was a cleavage between the liberal and conservative members"
   cleavage