fourth-generation: pertaining to or being a mobile device or communications technology that supports much faster data-transfer speeds than the previous version.
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British Dictionary definitions for 4g
fourth generation: a stage in mobile phone technology when data can be provided more quickly and on broader bandwidths than previously
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012