ANZUS (?ænz?s) n acronym for (Military) Australia, New Zealand, and the United States, with reference to the security alliance between themCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ANZUSAustralia, New Zealand, and US Pacific security treaty signed 1951. New Zealand withdrew 1985.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited