Gc UK/ˈd͡ʒi si/ uncommon dated informal uk vulgar noun 1. 1,000,000,000 periods per second SynonymsgigahertzGHzgigacycle per secondgigacycle Related words Broader terms rate WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved.
