Definition of "aboriginal"

Green in the Church-yard, beautiful and green; / […] / And mantled o'er with aboriginal turf / And everlasting flowers.

1814, William Wordsworth, The Excursion‎, Longman et al., page 277

Tashtego's long, lean, sable hair, his high cheek bones, and black rounding eyes— […] all this sufficiently proclaimed him an inheritor of the unvitiated blood of those proud warrior hunters, who, in quest of the great New England moose, had scoured, bow in hand, the aboriginal forests of the main.

1851 November 14, Herman Melville, “Knights and Squires”, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, page 131

Where else but from Nantucket did those aboriginal whalemen, the Red-Men, first sally out in canoes to give chase to the Leviathan?

1851, Herman Melville, Moby Dick, Chapter 2

It may be welldoubted whether this frog is an aboriginal of these islands.

1839, Charles Darwin, Journal of researches into the natural history and geology of the Countries Visited During the Voyage of H. M. S. Beagle

Every one of the groups of islands in the Pacific, many of them only a few days' sail from Australia, have their own customs, religious, political and social, and yet Australia has none, and the aboriginals have imbibed nothing from their intercourse with other nationalities.

1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 244