from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A subordinate ruler.
- n. One of four joint rulers.
- n. A governor of one of four divisions of a country or province, especially in the ancient Roman Empire.
- n. The commander of a subdivision of a phalanx in ancient Greece.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a governor of part of a country, especially of a fourth part of a province in ancient Rome
- n. an officer in charge of a fourth part of a phalanx in ancient Greece
from the GNU version of the Collaborative International Dictionary of English
- n. A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.
- adj. Four.
from The Century Dictionary and Cyclopedia
- n. One of any group of rulers or chiefs.
- In botany, having four centripetally developed xylem plates: said of some radial vascular cylinders.
- n. A stele which has four plerome strands.
- n. In the Roman empire, the ruler of the fourth part of a country or province in the East; a viceroy; a subordinate ruler.
- n. The commander of a subdivision of a Greek phalanx.
- Four principal or chief.
Middle English tetrarche, a Roman tetrarch, from Old French, from Late Latin tetrarcha, from Latin tetrarchēs, from Greek tetrarkhēs : tetra-, tetra- + -arkhēs, -arch.(American Heritage® Dictionary of the English Language, Fourth Edition)