noun (n)

• the formation of stonelike objects within a body organ (e.g., the kidneys)(noun.process)

  source: wordnet30
• a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body(noun.object)

  Synonym:
  calculus
  

  source: wordnet30
• an increase in the density of something(noun.event)

  Synonym:
  compaction, compression, densification
  

  source: wordnet30
• the union of diverse things into one body or form or group; the growing together of parts(noun.act)

  Synonym:
  coalescence, coalescency, coalition, conglutination
  

  source: wordnet30
• The process of concreting; the process of uniting or of becoming united, as particles of matter into a mass; solidification.(noun)

  source: webster1913