Of, pertaining to, or featuring interaction(adjective)
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Use "interactional" in a sentence
"Sometimes they cross their legs, put their hands on their laps, scratch their heads, and so forth in what has been termed interactional synchrony."
"Do you think that according to what has been stated so far and the possible plans of any kind of interactional dialogue between the U.S. and Iran, including on Afghanistan to begin with, do you think the recent statements would have any effect on that?"
"I also chose wellness because it suggests a different type of interactional arrangement particularly with the healthcare establishment."