n.
    - a person who shows people to their seats in a cinema or theatre or at a wedding.
 - Brit. a person employed to walk before a person of high rank on special occasions.
 - an official in a law court who swears in jurors and witnesses and keeps order.
 - archaic an assistant teacher.
 
v.
  - show or guide somewhere.
 - 
(usher something in)
 cause or mark the start of something new.
 
 
  Etymology
  ME (denoting a doorkeeper): from Anglo-Norman Fr. usser, from med. L. ustiarius, from L. ostiarius, from ostium ‘door’.