Definition of in one's prime
- She just retired, but she's still in her prime.
: the second of the canonical hours
: the first hour of the day usually considered either as 6 a.m. or the hour of sunrise
: the earliest stage
: first in time : original
: of, relating to, or being a prime number — compare relatively prime
: having no polynomial factors other than itself and no monomial factors other than 1
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