#1 host n. a person who invites guests to a social event (such as a party in his or her own home) and who is responsible for them while they are there. wn
#2 host n. [horde, legion] a vast multitude. wn
#3 host n. an animal or plant that nourishes and supports a parasite; it does not benefit and is often harmed by the association. wn
#4 host n. [master of ceremonies, emcee] a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers). wn
#5 host n. [legion] archaic terms for army. wn
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