The Collaborative International Dictionary
Coetaneously
Coetaneous \Co`e*ta"ne*ous\, a. [L. coaetaneus; co- + aetas age.] Of the same age; beginning to exist at the same time; contemporaneous. -- Co`e*ta"ne*ous*ly, adv.
And all [members of the body] are coetaneous.
--Bentley.