First or highest in rank, value, character, degree, or importance; most important; main; chief.

(品级上、价值上、性质上、程度上或重要上)最高的；最重要的；主要的；首要的。

One who takes the lead; the chief in authority.

首领；首长。

The head of an institution; esp. the head of a secondary school in the U.S. or of any of certain colleges in the British Empire.

校长(尤指美国中等学校校长；英国专科学校校长)。

A sum of money drawing interest.

【商】本金。

The person for whom an agent acts.

【法律】(由他人代表的)本人。

Actual perpetrator of a crime.

【法律】主犯。

Party to a contract.

【法律】契约的一方。

One of the supporting rafters at either end of a roof.

【建】大衍梁(= principal rafter)。

Principal person or thing.

主要的人物或事物。