concurrence

noun

Etymology: From Old French concurrence.

1. Agreement; concurring.
2. An instance of simultaneous occurrence.

   “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;...”

   “This book owes its existence to a concurrence of accidents.”