coetaneous

existing or occurring at the same period of time the Spanish founding of San Francisco and the British colonies' declaration of independence from the mother country were coetaneous events that occurred on opposite ends of the continent Synonyms contemporary, coeval, coexistent, coexisting, coextensive, coincident, coincidental, concurrent, contemporaneous, coterminous, simultaneous, synchronic, synchronousRelated Words accompanying, attendant, attending, concomitant, incidentAntonyms asynchronous, noncontemporary, nonsimultaneous, nonsynchronous