enrichment

Short definition from Wiktionary

Noun

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