The word "disunite" refers to the act of separating or causing division among people or groups. There are several antonyms that can be used to describe the opposite of "disunite." One antonym is "unify," which means to bring people or groups together in a harmonious and cooperative manner. Another antonym is "reconcile," which means to restore relationships or mend differences between people or groups. "Harmonize" is another antonym that can be used to describe bringing together different elements or ideas to create a unified whole. Other antonyms for "disunite" include "cooperate," "collaborate," and "unite." All of these words describe actions or states that promote unity and cooperation rather than division and separation.