solidification

/səˌlɪdɪfɪˈkeɪʃən/
noun
  1. The process of becoming solid or making something solid, especially from a liquid or gas.
    • In chemistry class, we observed the solidification of melted wax as it cooled.
    • The solidification of lava into rock can take many years.
    • The solidification of concrete happens quickly once it is poured.