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A renewal of youthful appearance or character.

re·ju′ve·nes′cent adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Theory of cyclic ageing and rejuvenescence of plants, Moscow.
Chingwah's college years were filled with myriad and diverse activities, including chairing the western department of the Chinese Christian Students' Association; writing creative works, including a short story that was published in a local newspaper; acting in a student-written play called Rejuvenescence; and organizing luncheons and events for students to mingle and learn as a part of the International Club at UC Berkeley.