# tetrarch

> English word · Noun · IPA /ˈtɛtɹɑɹk/

## Definitions
1. A governor or ruler of a quarter of a country, especially of a fourth part of a province in or client state of Ancient Rome.
2. Each of the four members of a jointly ruling tetrarchy, notably of the Roman Empire since Diocletian.
3. An officer in charge of a fourth part of a phalanx in Ancient Greece.

## Etymology
Borrowed from Latin tetrarchēs, from Ancient Greek τετράρχης (tetrárkhēs), from τετρα- (tetra-, “four”) + -άρχης (-árkhēs, “ruler, leader”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tetrarch