rejuvenescence

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re·ju·ve·nes·cence

(rē-jū'vĕ-nes'ĕnts),
A renewal of youth; return of a cell or tissue to a state in which it was in an earlier stage of existence.
[L. re-, again, + juvenesco, to grow young, fr. juvenis, a youth]

rejuvenescence

(rĭ-jū″vĕ-nĕs′ĕns) [″ + juvenescere, to become young]
The renewal of youth; the return to an earlier stage of existence.