host

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One who receives or entertains guests in a social or official capacity.
• noun A person who manages an inn or hotel.
• noun One that furnishes facilities and resources for a function or event.
• noun The emcee or interviewer on a radio or television program.
• noun Biology The animal or plant on which or in which another organism lives.
• noun Medicine The recipient of a transplanted tissue or organ.
• noun A computer or other device providing data or services that a remote computer can access by means of a network or modem.
• noun A computer that is connected to a TCP/IP network, such as the Internet.
• transitive verb To serve as host to or at.
• transitive verb To provide software that offers data or services, hardware, or both over a computer network.
• noun An army.
• noun A great number; a multitude. synonym: multitude.
• noun The consecrated bread or wafer of the Eucharist.

from The Century Dictionary.

• To assemble or move as an army.
• noun An army; a multitude of men organized for war.
• noun Any great number or multitude.
• To administer the sacrament to.
• noun Same as hoast.
• noun One who receives and entertains another in his own house, whether gratuitously or for pay; an entertainer; specifically, the landlord of a public house or inn: the correlative of guest.
• noun An animal or a plant in relation to a parasite habitually dwelling in or upon it. The correlative term, in either case, is guest. See commensal, guest, inquiline, parasite, hyperparasite.
• noun In zoölogy the term is a very general and comprehensive one, since almost all animals are infested, or liable to infestation, by parasites of some kind; and some parasites are themselves hosts of others.
• noun In mineralogy, a mineral which incloses another.
• noun One who is entertained by another as his guest; a guest.
• noun An inn; a lodging.
• To lodge, as at an inn; receive entertainment; be a guest.
• To give entertainment to; receive as a guest.
• noun An offering; a sacrifice.
• noun In the Western Ch.: The sacramental victim in the eucharist; Christ offered under the species of bread and wine, or under either species separately.
• noun One of the pieces of bread used for consecration in the mass or eucharist; au altar-bread, oblate, or wafer.

from the GNU version of the Collaborative International Dictionary of English.

• noun (R. C. Ch.) The consecrated wafer, believed to be the body of Christ, which in the Mass is offered as a sacrifice; also, the bread before consecration.
• noun An army; a number of men gathered for war.
• noun Any great number or multitude; a throng.
• noun One who receives or entertains another, whether gratuitously or for compensation; one from whom another receives food, lodging, or entertainment; a landlord.
• noun (Biol.) Any animal or plant affording lodgment or subsistence to a parasitic or commensal organism. .
• intransitive verb obsolete To lodge at an inn; to take up entertainment.
• transitive verb obsolete To give entertainment to.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A multitude of people arrayed as an army; used also in religious senses, as: Heavenly host (of angels)
• noun A large number of items; a large inventory.
• noun Catholicism The consecrated bread or wafer of the Eucharist.
• noun A person who allows a guest, particularly into the host’s home.
• noun A person or organization responsible for running an event.
• noun A moderator or master of ceremonies for a performance.
• noun computing, Internet, Unix Any computer attached to a network.
• noun computing, networking A computer or software component that provides services.
• noun biology A cell or organism which harbors another organism or biological entity, usually a parasite.
• noun evolutionism, genetics An organism bearing certain genetic material.
• noun Consecrated bread such as that used in the Christian ceremony of the Eucharist.
• verb To perform the role of a host.
• verb obsolete, intransitive To lodge at an inn.