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Definition of Crosspost
1. Noun. (computing) An electronic message posted to multiple newsgroups simultaneously. ¹
2. Noun. (computing) An act of crossposting. ¹
3. Verb. (context: computing transitive) To post (a message) to multiple newsgroups simultaneously. ¹
4. Verb. (context: computing intransitive) To make a crosspost. ¹
¹ Source: wiktionary.com