penecontemporary

Etymology
en

Adjective

 * 1) That lived or existed at almost the same time (as another/others); nearly contemporary

Noun

 * 1) That which is penecontemporary, living or existing at almost the same time (as another/others)

Usage notes
Both the noun and adjective senses are typically used to refer to the past, especially periods of time in the distant past for which exact dates of events are unknown.