A person who receives or entertains other people as guests. An animal or plant on or in which a parasite or commensal organism lives. A computer that mediates multiple access to databases mounted on it or provides other services to a computer network. A large number of people or things. The bread consecrated in the Eucharist. Act as host at (an event) or for (a television or radio program). Store (a website or other data) on a server or other computer so that it can be accessed over the Internet.