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A Cleavage

  1. The act of cleaving or the state of being cleft. [from 19th c.]
  2. The hollow or separation between a woman's breasts, especially as revealed by a low neckline. [from 20th c.]
  3. (by extension) Any similar separation between two body parts, such as the buttocks or toes.
  4. (biology) The repeated division of a cell into daughter cells after mitosis. [from 19th c.]
  5. (chemistry) The splitting of a large molecule into smaller ones.
  6. (mineralogy) The tendency of a crystal to split along specific planes. [from 19th c.]
  7. (politics) The division of voters into voting blocs.
Synonyms

(separation between breasts): intermammary sulcus