A manager of a hacienda, ranch or estate.
Any overseer, organizer, person in command.
The head servant or official in a royal Spanish or Italian household; later, any head servant in a wealthy household in a foreign country; a leading servant or butler.
The member of staff at a restaurant who keeps the wine cellar and advises the guests on a choice of wines; a wine steward / stewardess, a wine waiter / waitress / server.
To act as a sommelier.