noun (n)

• the state of being split or cleft(noun.state)

  Example:
  There was a cleavage between the liberal and conservative members.
  

  source: wordnet30
• the breaking of a chemical bond in a molecule resulting in smaller molecules(noun.process)

  source: wordnet30
• (embryology) the repeated division of a fertilised ovum(noun.process)

  Synonym:
  segmentation
  

  source: wordnet30
• the line formed by a groove between two parts (especially the separation between a woman's breasts)(noun.body)

  source: wordnet30
• the act of cleaving or splitting(noun.act)

  source: wordnet30
• The act of cleaving or splitting.(noun)

  source: webster1913