concomitance of articulation, as in fro, ostensibly a succession of three discrete sounds but physically a single articulation (f-) blending into a coarticulation (-fr-), which blends into an articulation (-r-), which blendsinto a coarticulation (-ro-), which blends into an articulation (-o)

the movement during the articulation of a given sound of one or more articulators not directly involved in producing the sound