Definition of metacommunication in US English:
metacommunication
noun
Linguistics
Communication which underlies or takes place alongside a given act of communication, and serves to supplement or enhance it; an instance of this.
Origin
1950s. From meta- + communication. Compare metacommunicative.
Pronunciation
metacommunication
/ˌmɛtəkəˌmjuːnɪˈkeɪʃn/