Etymology
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outback (n.)

"back-country, interior regions of Australia," 1907, Out Back, Australian English, originally an adverb, "out in the back settlements" (1878), from out (adv.) + back (adv.).

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Definitions of outback
1
outback (n.)
the bush country of the interior of Australia;
2
outback (adj.)
inaccessible and sparsely populated;
Synonyms: remote
From wordnet.princeton.edu