A leader of a clan or tribe. / (by extension) A leader of a group.

plural of chieftain

(uncountable) The state of being a chieftain / (countable) The area ruled by a chieftain

plural of chieftainess

A female chieftain. / The wife of a chieftain.

plural of chieftainship

plural of chieftaincy

The position or period of rule of a chief. / The area or population ruled by a chief.

Befitting a chieftain.

The role or status of chieftain.