1. To get something back which was lost or taken away: Constance was reclaiming the money and jewels from the police which were stolen by the burglar who was caught and arrested.
2. To make land, which was covered by flood waters, fit again for cultivation: An environmental group was helping farmers reclaim acres of fields so they could start growing their crops again.
3. To recover materials for reuse by freeing them from impurities: Plastics, rubber, and some other elements are being reclaimed by rendering them acceptable for the production of usable items again.