4G abbreviation for (Telecommunications) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014