concurrence

What it means

1. countableuncountableAgreement; concurring.
2. countableuncountableAn instance of simultaneous occurrence.

   This book owes its existence to a concurrence of accidents.

   1862, John Hill Burton, The Book-hunter, etc., Edinburgh; London: William Blackwood & Sons, Advertisement

   1 more example

   The time came when they ceased to cry and began to think; by the way, if Georgiana had not, from a concurrence of circumstances, been enabled to eat her breakfast, this operation of the mind could not have been engaged in without further injury, for she was, indeed, weak and exhausted;...

   1842, [anonymous collaborator of Letitia Elizabeth Landon], chapter XXIV, in Lady Anne Granard; or, Keeping up Appearances. […], volume II, London: Henry Colburn, […], →OCLC, page 11

In a sentence

The time came when they ceased to cry and began to think; by the way, if Georgiana had not, from a concurrence of circumstances, been enabled to eat her breakfast, this operation of the mind could not have been engaged in without further injury, for she was, indeed, weak and exhausted;...

1842, [anonymous collaborator of Letitia Elizabeth Landon], chapter XXIV, in Lady Anne Granard; or, Keeping up Appearances. […], volume II, London: Henry Colburn, […], →OCLC, page 11

Where it comes from

1. Old Frenchconcurrence
2. Englishconcurrence

From Old French concurrence.