From BCMpedia. A Wiki Glossary for Business Continuity Management (BCM) and Disaster Recovery (DR).
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1. Host is an organism on or in which other organism lives.

(Source: Business Continuity Management Institute - BCM Institute)

2. A host computer comprises the central hardware and software resources of a computer complex; e.g., CPU, memory, channels, disk and magnetic tape I0 subsystems plus operating and applications software. The term is used to denote all non-network items.

(Source: OGC, Information Technology Infrastructure Library (ITIL) v3)

3. A host is an organism in which a parasite lives and by which it is nourished.

(Source: Centers for Disease Control and Prevention)