NZEF abbreviation for (Military) New Zealand Expeditionary Force, the New Zealand army that served throughout World War I. 2NZEF is used to refer to the Second New Zealand Expeditionary Force, in World War II Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014