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In page Outback:

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The term "outback" derives from the adverbial phrase referring to the back yard of a house[citation needed], and came to be used meiotically in the late 1800s to describe the vast sparsely settled regions of Australia behind the cities and towns. The earliest known use of the term in this context in print was in 1869, when the writer clearly meant the area west of Wagga Wagga, New South Wales.[1] Over time, the adverbial use of the phrase was replaced with the present day noun form.[2]