What is Chiefest?

Chiefest definition and meaning on Dictionary terms:
the head or leader of an organized body of people; the person highest in authority: the chief of police.
the head or ruler of a tribe or clan: an Indian chief.
(initial capital letter) U.S. Army. a title of some advisers to the Chief of Staff, who do not, in most instances, command the troop units of their arms or services: Chief of Engineers; Chief Signal Officer.

Informal. boss or leader: We’ll have to talk to the chief about this.
Heraldry. the upper area of an escutcheon. an ordinary occupying this area.

highest in rank or authority: the chief priest; the chief administrator.
most important; principal: his chief merit; the chief difficulty.

Archaic. chiefly; principally.

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