coetaneous

adj

1. Belonging to the same age, era or period; coeval or contemporary.

   “The beginning of [Theodore] Parker's own perplexities was almost coetaneous with the establishment of Brook Farm, for his 'Discourse of the Transient and Permanent in Religion,' which was preached at the ordination of Mr. Shackford in South Boston, on May 19, 1841, occasioned the division of the religious community for and against him.”