If it is assumed that communication has no beginning or end, then it is termed as

Communication seen as having no beginning or end is described as a process, ongoing and continuous.

Process here names a series of changing, flowing events without a fixed start or stopping point.

Mediation refers to a third party helping resolve a dispute, not to the endless flow of communication.

Interaction names a mutual exchange between parties rather than the beginningless, endless character itself.

Transaction stresses simultaneous shared meaning making, a related but distinct emphasis.

Calling communication a process highlights that meaning keeps evolving over time.