"regeneration" in the noun sense
1. regeneration
biology) growth anew of lost tissue or destroyed parts or organs
2. positive feedback, regeneration
feedback in phase with (augmenting) the input
3. regeneration
the activity of spiritual or physical renewal
4. re-formation, regeneration
forming again (especially with improvements or removal of defects renewing and reconstituting
Source: WordNet® (An amazing lexical database of English)
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