Concomitance

n.	1.	The state of accompanying; accompaniment. The secondary action subsisteth not alone, but in concomitancy with the other. - Sir T. Browne.
	2.	(R.C.Ch.) The doctrine of the existence of the entire body of Christ in the eucharist, under each element, so that the body and blood are both received by communicating in one kind only.

Noun

1.

concomitance - occurrence or existence together or in connection with one another

co-occurrence, coincidence, concurrence, conjunction