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In page Australian English:

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Internationally well-known examples of Australian terminology include outback, meaning a remote, sparsely populated area, the bush, meaning either a native forest or a country area in general, and g'day, a greeting. Dinkum, or fair dinkum means "true", "legitimate" or "is that true?", among other things, depending on context and inflection.[1] The derivative dinky-di means "true" or devoted: a "dinky-di Aussie" is a "true Australian".[citation needed]