from The American Heritage® Dictionary of the English Language, 5th Edition.
noun A subordinate ruler.
noun One of four joint rulers.
noun A governor of one of four divisions of a country or province, especially in the ancient Roman Empire.
noun The commander of a subdivision of a phalanx in ancient Greece.
from The Century Dictionary.
noun In the Roman empire, the ruler of the fourth part of a country or province in the East; a viceroy; a subordinate ruler.
noun The commander of a subdivision of a Greek phalanx.
Four principal or chief.
noun One of any group of rulers or chiefs.
In botany, having four centripetally developed xylem plates: said of some radial vascular cylinders.
noun A stele which has four plerome strands.
from the GNU version of the Collaborative International Dictionary of English.
noun (Rom. Antiq.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.
adjective obsolete Four.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
noun a governor of part of a country, especially of a fourth part of a province in ancient Rome
noun an officer in charge of a fourth part of a phalanx in ancient Greece
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Middle English tetrarche, a Roman tetrarch, from Old French, from Late Latin tetrarcha, from Latin tetrarchēs, from Greek tetrarkhēs : tetra-, tetra- + -arkhēs, -arch.]
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Examples
The title tetrarch literally denotes one who rules over a fourth part of any country.
The word tetrarch properly denotes one who presides over a fourth part of a country or province; but it also came to be a general title, denoting one who reigned over any part -- a, third, a half, &c. In this case Herod had a third of the dominions of his father, but he was called tetrarch.
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