"act or state of being or appearing to grow young again," 1834, noun of action from rejuvenate.
Entries linking to rejuvenation
rejuvenate v.
"restore the appearance, powers, or feelings of youth to," 1807, an irregular formation from re- "again" + Latin juvenis "young" (see young (adj.)) + -ate (2). Related: Rejuvenated; rejuvenating.