Contemporaneous

adjective/kənˌtɛm.pəˈɹeɪ.ni.əs/general

Definition

Existing or occurring in the same period of time.

Etymology

Adapted borrowing of Latin contemporāneus (“contemporary”) +‎ -ous, from con- (“with”) + tempus (“time”) + -āneus (“of or pertaining to”, compare Late Latin temporāneus (“opportune, timely”)).

Synonyms

contemporary, synchronic, synchronous, coeval, synchronal

In a sentence

The two outages were contemporaneous but had unrelated causes.