Quadrumvir

Part of speech: noun

Definitions

1. A collective of four people who collaborate in leadership roles
2. An organization consisting of four individuals who share and exercise governance
3. A body composed of four people who jointly hold authority and decision-making power

Etymology: The Roman Republic had a famous arrangement in which three men shared supreme power, and English borrowed the word "triumvir" to name each of them. "Quadrumvir" is that same pattern stretched to four: "quadri-" means "four," and the "-umvir" ending is the same one that closes "triumvir," so the new word describes a governing body of four members rather than three. The structure is a compound built on an existing model. Latin had its own parallel, "quattuorvir," which described a member of a four-man magistracy in Roman towns, and English took its cue from that pattern. The result is a term whose meaning is transparent once you know the Latin "vir," meaning "man," that sits at the heart of both words.