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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.

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

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.

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.

"The title tetrarch literally denotes one who rules over a fourth part of any country."

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