1. The process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone
   "The fossilisation of the dinosaur bones took millions of years";
   - fossilization
    
2. Becoming inflexible or out of date
   "The fossilisation of their business practices led to their eventual downfall";
   - fossilization

Derived forms: fossilisations

Type of: action, activity, natural action, natural process, passage, transition

Encyclopedia: Fossilisation