- coetaneous (adj.)
[coetaneous 词源字典]
- "having the same age," c. 1600, from Late Latin coaetanus "one of the same age," from com- "with, together with" (see co-) + aetat- "age" (see age (n.)) + adjectival suffix -aneus.[coetaneous etymology, coetaneous origin, 英语词源]