a person who receives or entertains guests socially or officially
an innkeeper
mine host
a person or establishment, etc that provides facilities for an event or function
Our college served as host for the chess tournament
a living animal or plant on or in which a parasite or smaller organism lives
an individual into which a tissue or part is transplanted from another
a compere on a radio or television programme
a computer that provides services to others linked up to it, e.g. access to the databases stored in it
[Middle English hoste host, guest, via Old French from Latin hospit-, hospes]