Australia Day

Formerly Foundation Day.
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British Dictionary definitions for australia day

Australia Day

noun
  1. a public holiday in Australia, commemorating the landing of the British in 1788: observed on the first Monday after Jan 26
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