coincident

Etymology

French coïncident

adj

1. (of two events) Occurring at the same time.
   1987, David Foster Wallace, “Lyndon” in Paula Geyh et al. (eds.), Postmodern American Fiction, New York and London: Norton, 1998, p. 380, He seemed unable to shake the bronchitis and the coincident infections it opened him to.
2. (of two objects) Being in the same location.
   Hitherto, the Universe of stars has always been considered as coincident with the Universe proper […] 1848, Edgar Allan Poe, “Eureka: A Prose Poem”, in The Works of Edgar Allan Poe, volume 2, New York: W. J. Widdleton, page 131
   The plot of the Atlantic currents and Atlantic winds is almost, though not quite, coincident. 1954, James Fisher, R. M. Lockley, chapter 1, in Sea-Birds, Boston: Houghton, Mifflin, page 4
3. Being in accordance, matching.
   the whole Doctrine of Christianity teaches nothing, but what is perfectly suteable to, and coincident with, the Ruling Principles that a vertuous, and well Inclined man is Acted by; 1679, Robert South, “A Sermon upon the 7. John 17”, in Sermons Preached upon Several Occasions, Oxford: Richard Davis and William Nott, page 290
   As to any other laws that slave-holders may make among themselves, as respecting slaves, they can be of no better kind, nor give them any better character, than what is implied in the common report—that there may be some honesty among thieves. This may seem a harsh comparison, but the parallel is so coincident that, I must say, I can find no other way of expressing my Thoughts and Sentiments […] 1787, Ottobah Cugoano, Thoughts and Sentiments on the Evil and Wicked Traffic of the Slavery and Commerce of the Human Species, London, page 4

noun

1. Either of multiple simultaneous related incidents
   December 14, 1808, Sir Humphry Davy, letter to Davy When I was in London I was shocked at the alteration in our friend Tobin's looks and appearance. Those who always interpret two coincidents into cause and effect would surmise that marriage has been less conducive to his health than to his moral comfort.