- Noun. An honorific for the head of state of a republic; see president (definition 1).
- Noun. The head of state of a republic, a representative democracy and sometimes (in cases of constitutional violations) a dictatorship.
- Noun. 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.
- Noun. A person presiding over a meeting, chair, presiding officer, presider.