Roget's Thesaurus: Entry 120 (Synchronism)

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#120. Synchronism. -- N. synchronism; coexistence, coincidence; simultaneousness, simultaneity &c. adj.; concurrence, concomitance, unity of time, interim.

[Having equal times] isochronism[obs].

contemporary, coetanian[obs].

V. coexist, concur, accompany, go hand in hand, keep pace with; synchronize.

Adj. synchronous, synchronal[obs], synchronic, synchronical, synchronistical[obs]; simultaneous, coexisting, coincident, concomitant, concurrent; coeval, coevous[obs]; contemporary, contemporaneous; coetaneous[obs]; coeternal; isochronous.

Adv. at the same time; simultaneously &c. adj.; together, in concert, during the same time; in the same breath; pari passu[Lat]; in the interim; as one.

at the very moment &c. 113; just as, as soon as; meanwhile &c. (while) 106.