1. Commonwealth of Australia - Noun
2. Commonwealth of Australia - Proper noun
a nation occupying the whole of the Australian continent; Aboriginal tribes are thought to have migrated from southeastern Asia 20,000 years ago; first Europeans were British convicts sent there as a penal colony
Source: WordNetThe Church of United Kingdom of Australia organised the event for what its Facebook site described as a Commonwealth of Australia Day event, where they encouraged masks not to be worn. Source: Internet