Definition of "reintroduction"

reintroduction

noun
plural reintroductions
1. The act of introducing something again.
2. The release of animals from captivity into the wild, especially, into an area where they have become extirpated or greatly reduced.
  Quotations
  The IUCN (International Union for the Conservation of Nature), for example, restricts use of the word ʽreintroductionʼ to species that have become extinct locally or Europe-wide no more than 200 to 300 years ago.
  2018, Tim Flannery, Europe: A Natural History, page 195
3. (countable) An animal so released.