Definition of "enrichment"

enrichment

noun
countable and uncountable, plural enrichments
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. (education) Extracurricular activities for students.
5. Stimulation provided for the mental wellbeing of a captive animal.
  Quotations
  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, Marc Bekoff, Encyclopedia of Animal Rights and Animal Welfare, 2nd Edition, page 208