enrichment

noun5

1. •
   The act of enriching or something enriched.
2. •
   The process of making enriched uranium.
3. •
   The addition of sugar to grape juice used to make wine; chaptalization.
4. •
   Extracurricular activities for students.
5. •
   Stimulation provided for the mental wellbeing of a captive animal.

   • The practice of enrichment to address these problems started in zoos and later spread to more intensively managed captive settings, such as farming and animal laboratories. — 2009