crystallization

Short definition from Wiktionary

Noun

1. 1
   The act or process by which a substance in solidifying assumes the form and structure of a crystal, or becomes crystallized.
2. 2
   The body formed by crystallizing.
3. 3
   The formation of a solid from a solution, melt, vapour or from a different solid phase
4. 4
   The process or the result of becoming more definite or precise.