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Definition of Hostname
1. Noun. (computing) the unique name by which any device attached to a network is known. ¹
2. Noun. (computing) (Internet) a computer or other network device's Internet domain name; a fully qualified hostname ¹
3. Noun. (computing) (Internet) the portion of a computer's Internet domain name that comes before the first period; an unqualified hostname ¹
¹ Source: wiktionary.com