Intercurrence is a term that refers to the occurrence of a secondary event or situation during another event or situation. There are several synonyms for the word intercurrence, including contingency, incident, occurrence, event, and happening. These words all describe a situation or event that happens alongside or at the same time as something else. Other synonyms for intercurrence include accident, coincidence, emergence, and phenomenon. These words all describe a situation that arises unexpectedly or is out of the ordinary. Whether you need to describe a medical situation or a coincidence in your life, there are many different words you can use in place of intercurrence.