coincident UK /kəʊˈɪnsɪd(ə)nt/US /koʊˈɪnsəd(ə)nt/adjective 4noun 1forms 3 adjective4 •Of two or more events: occurring at the same time; contemporaneous.General trends, like the coincident decline of the nation-state and the growth of antisemitism, can hardly ever be explained satisfactorily by one reason or by one cause alone. — 1951 •Of two or more things: having the same qualities; being in accordance; consonant, matching. •Of two or more objects: being in the same location.[T]he sides of the angles A and D are coincident; vvherefore those angles are equall. VVhich vvas to be Dem[onstrated]. — 1660 •(no longer used) Chiefly followed by to: accompanying, concomitant, incident.Empires of Kings, are novv, and ever vvere / As Salust saith, co-incident to feare. — 1648 noun1 •(no longer used) One of multiple incidents or things which coincide with each other; a concomitant. formscoincidents · more coincident · most coincident