host

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

A good host is always considerate of the guest’s needs.
Our company is host of the annual conference this year.
The host was terrible, but the acts themselves were good.
Viruses depend on the host that they infect in order to be able to reproduce.
The so-called junk DNA is known, so far, to provide no apparent benefit to its host.