rə̇ˌjüvəˈnes ə n(t)s, (ˌ)rēˌj- noun
( -s )
Etymology: Medieval Latin rejuvenesc ere to become young again (from Latin re- + juvenescere to become young, from juvenis young person) + English -ence
1. : a renewal of youth : a restoration of physical, mental, or spiritual youthfulness : rejuvenation 1
secure a new lease of life and rejuvenescence of his divine energies — E.O.James
2. : reinvigoration of an individual or strain especially when following and dependent on some change in its vital behavior (as associated with zoospore formation in various lower algae or held to follow conjugation in some protozoans)