1. A commander; the head of a clan; the head of a Highland clan.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• chirstain,
• chieftan,
• cheiftain,
• chistain,
• chieftans,
• chieften,
• chieftian,
• chigatai,
• xhieftain,
• vhieftain,
• fhieftain,
• dhieftain,
• cgieftain,
• cbieftain,
• chiefain,
• chieftin,
• chieftein,
• chietai,
• chieffrie,
• Chienolin

• chieftan,
• chieftaincy.

The adjective form of the word "chieftain" is "chieftainly". Nonetheless, this is considered an uncommon and less commonly used adjective form, and a more appropriate alternative might be "chiefly".

The plural of the "chieftain" can be the "chieftains".

The singular of the "chieftain" can be the "chieftain".