Here's a question and a few possible answers: 

Q: What is the opposite of dissociate with someone?
Possible A: fuse, unit, join, combine, incorporate

Why is "join" an answer aligned with human common sense? 


dissociate is the opposite of associate. it comes from the latin dissociare, which means basically "to disunite." to dissociate is to stop associating with someone. if a relationship ends, the two people are dissociated from one another.