Host (masculine) and hostess (feminine) most often refer to a person responsible for guests at an event or providing hospitality during it, or to anevent's presenter or master or mistress of ceremonies
• Host (biology), an organism harboring another organism or organisms on or in itself
• Sacramental bread, called the host or hostia, used in Christian liturgy
• Host (psychology), personality as emphasized in treating dissociative identity disorder
• Host (radio), the presenter or announcer on a radio show
• Talk show host, a presenter of a TV or radio talk show
• the Maître d'hôtel (Maître d') or head waiter of a restaurant or hotel
Computing
Host (network), a computer connected to the Internet or another IP-based network
• Hosts file, a computer file to be used to store information on where to find an internet host on a computer network
• host (Unix), a command-line Unix command
• Internet hosting service, a service that runs Internet servers allowing organizations and individuals to serve content to the Internet
• Virtual host, allowing several DNS names to share the same IP address
Groups or formations
• Cossack hosts comprised organic and administrative subdivision of Cossacks in Imperial Russia. Host names reflected location or origin.
• Furious Host or the Wild Hunt, a European folk myth
• Heavenly host, an "army" of good angels in Heaven
• Lord of hosts, a common epithet of the God of the Old Testament
• a great number; multitude
• (Military) an archaic word for army