Definition of "Host" :

noun: an animal or plant that nourishes and supports a parasite; it does not benefit and is often harmed by the association

noun: (computer science) a computer that provides client stations with access to files and printers as shared resources to a computer network

noun: a technical name for the bread used in the service of Mass or Holy Communion

noun: a vast multitude

noun: archaic terms for army

noun: any organization that provides resources and facilities for a function or event

"Atlanta was chosen to be host for the Olympic Games."

noun: the owner or manager of an inn

noun: a person who invites guests to a social event (such as a party in his or her own home) and who is responsible for them while they are there

noun: (medicine) recipient of transplanted tissue or organ from a donor

noun: a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)

verb: be the host of or for

"We hosted 4 couples last night."