Sentence:  Inasmuch as it is impossible to analyze the contents of an entire interpersonal relationship, it is helpful to conceptualize a given communication event as consisting of a series of "subevents". Any one subevent may be pulled out as a basic unit for analysis in the study of interpersonal communication; this basic unit may then be called an <WSD>"interact</WSD>". ... each <WSD>interact</WSD> is a distinctive attempt to conceal, repeat, or disclose information and/or to influence the relationship. 
Meaning of the word marked with <WSD> tags:  A pair or series of acts involving more than one person.