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Definition of Blackhole
1. Noun. (alternative spelling of black hole), especially in the attributive. ¹
2. Noun. (Internet) A place where traffic is silently discarded. ¹
3. Noun. (programming) A bit bucket; a place of permanent oblivion for data. ¹
4. Noun. (computing) DNSBL, used to block spamming IP addresses – are often called "blackhole lists" ¹
5. Noun. (Internet) A blackhole server, a DNS server that handles reverse lookups of invalid IP ranges ¹
6. Noun. (management) A resource sink. ¹
¹ Source: wiktionary.com