aboriginal (adj.) Look up aboriginal at Dictionary.com
1660s, "first, earliest, existing from the beginning," especially in reference to inhabitants of lands colonized by Europeans, from aborigines (see aborigine) + -al (1). The specific Australian sense is attested from 1820. The noun meaning "an original inhabitant, an autochthon" is attested from 1767, in a Massachusetts context. Related: Aboriginally; aboriginality; aboriginalism.