mediar
mediate
mediate
to intervene between people in a dispute
+
-ar
infinitive verb suffix
Mediar means to mediate and can be thought of as mediate0 + -ar1 (infinitive verb suffix1).
verb
  1. mediate
    To intervene between two or more people or groups to resolve a disagreement
    El diplomático intentó mediar en el conflicto. // The diplomat tried to mediate in the conflict.