It simply means "be happy". The line goes Australians, all, let us rejoice, for we are young and free. So the word 'rejoice' means to be happy about being an Australian in the new, young, progressive country.
happy new year
Australian is just like English with an accent. We say, "Happy New Year (mate)".
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The Australian word for tipster is "punter."
The Australian word for the Australian language is English. Or if you mean "G'day" and "Bonza, mate", we call that Strine.
The only Australian word for 'welcome' is welcome.
The Australian aboriginal word for dragonfly is "migiwirrwarr". The Australian aboriginal word for butterflies is "bunpa" and for fruit is "gunydja".
The Australian word for 'mustang' (wild horse) is "Brumby".
The word 'Australian' is a noun, a proper noun; a word for a resident of or someone from Australia; a word for a person.The word 'Australian' is also an proper adjective, a word that describers something as of or from Australia.
The word 'happy' is an adjective, a word that describe a noun: a happy baby, a happy time.The noun form for the adjective happy is happiness.
The root word for happiness is HAPPY.