occurrence or existence together or in connection with one another, coexistence
A concomitant.
The Roman Catholic 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 communication in one kind only.
The quality or state of being simultaneous; simultaneousness.
More than one complete musical texture occurring at the same time. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow, and others.