Definitions

1. noun

A government or position consisting of three persons having equal power or authority.

“The ancient Roman republic was known for its triumvirates and diumvirates, but it was the diumvirate of the two consuls that held the most power.”

2. noun

A group of three persons acting together in a particular capacity.

“The diumvirate of the three lead actors in the play was impressive, with each one bringing their own unique energy to the stage.”