President

1. An act in the past which may be used as an example to help decide the outcome of similar instances in the future.
2. A decided case which is cited or used as an example to justify a judgment in a subsequent case.
3. An established habit or custom.
4. (with definite article) The aforementioned (thing).
5. The previous version.
6. A rough draught of a writing which precedes a finished copy.

1. The head of state of a republic.

   The vast majority of presidents have been male.

2. In presidential republics, the head of government and head of state.
3. Primary leader of a corporation. Not to be confused with CEO, which is a related but separate position that is sometimes held by a different person.
4. A person presiding over a meeting, chair, presiding officer, presider.

adjective

Occupying the first rank or chief place; having the highest authority; presiding.