a person who escorts people to seats in a theater, church, etc.

a person acting as an official doorkeeper, as in a courtroom or legislative chamber.

a male attendant of a bridegroom at a wedding.

an officer whose business it is to introduce strangers or to walk before a person of rank.

British Archaic . a subordinate teacher or an assistant in a school.

to act as an usher to; lead, introduce, or conduct

She ushered them to their seats.

to attend or bring at the coming or beginning; precede or herald (usually fol. by in )

to usher in the new theater season.

to act as an usher

He ushered at the banquet.

verb

usher