usher (n.)

late 13c., "servant who has charge of doors and admits people to a chamber, hall, etc.," from Anglo-French usser (12c.), Old French ussier, uissier "porter, doorman," from Vulgar Latin *ustiarius "doorkeeper," variant of Latin ostiarius "door-keeper," from ostium "door, entrance," from os "mouth," from PIE *os- "mouth" (see oral). Fem. form usherette is attested from 1913, American English.

usher (v.)

1590s, "conduct, escort, admit ceremoniously," from usher (n.). Related: Ushered; ushering.

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Definitions of usher from WordNet
usher (n.)
an official stationed at the entrance of a courtroom or legislative chamber;
Synonyms: doorkeeper
usher (n.)
someone employed to conduct others;
Synonyms: guide
usher (v.)
take (someone) to their seats, as in theaters or auditoriums;
The usher showed us to our seats
Synonyms: show
Usher (n.)
Irish prelate who deduced from the Bible that Creation occurred in the year 4004 BC (1581-1656);
Synonyms: Ussher / James Ussher / James Usher