Intervenience is a rare and formal term that refers to the act of intervening in a situation. However, there are several synonyms for the word that are more commonly used and understood by most people. These include intervention, interference, intrusion, mediation, intercession, involvement, and interposition. Each of these words conveys the idea of stepping in or getting involved in a situation that may not directly concern oneself. Whether it is to resolve a conflict, offer assistance or to prevent harm, these synonyms for intervenience accurately describe the act of stepping in and taking action to make things better.