Host meaning : One which receives or entertains a guest, socially, commercially, or officially. One that provides a facility for an event. A person or organization responsible for running an event. A moderator or master of ceremonies for a performance. Any computer attached to a network. A cell or organism which harbors another organism or biological entity, usually a parasite. (evolution) An organism bearing certain genetic material. A paid male companion offering conversation and in some cases sex, as in certain types of bar in Japan. To perform the role of a host. To lodge at an inn. To run software made available to a remote user or process.