the world > time > relative time > simultaneity or contemporaneousness > [adverb] > isochronously or in phase (4)
in an isochronous manner; in equal times.
(With reference to recurrent or periodic movement): At the same successive instants of time; at the same rate and exactly together; in time with.
Physics. A particular stage or point in the cycle of a periodic phenomenon (esp. an alternating current or a light wave), or in a recurring…