a separate seat for one person, typically with a back and four legs

the person in charge of a meeting or of an organization (used as a neutral alternative to chairman or chairwoman)

she's the chair of a research committee

a professorship

he held a chair in physics

a metal socket holding a rail in place on a railway sleeper

act as chairperson of or preside over (an organization, meeting, or public event)

the debate was chaired by the Archbishop of York

carry (someone) aloft in a chair or in a sitting position to celebrate a victory

no one seemed anxious to chair him round the hall