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  1. (biology) The state or process of ageing, esp. in humans; old age
  2. (cell biology) Ceasing to divide by mitosis because of shortening of w:telomere, telomeres or excessive DNA damage
  3. (gerontology) old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time
  4. (botany) Fruit senescence,leading to ripening of fruit,generally.
    Etymology: From Latin senescere, to grow old.

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