noun (n)

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

  Synonym:
  cleavage
  

  source: wordnet30
• the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart(noun.act)

  Synonym:
  division, partition, partitioning, sectionalisation, sectionalization
  

  source: wordnet30
• The act or process of dividing into segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation.(noun)

  source: webster1913