To act as a flagship for.
The most important one out of a related group.
The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag.
The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet.
To act as president; to do presidential duties.
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.
In presidential republics, the head of government and head of state.
The head of state of a republic.
A person presiding over a meeting; a chair, presiding officer, presider.