Existing from the origin or beginning; hence, first; original; primitive: as, aboriginal people are the first inhabitants of a country known to history.Pertaining to aborigines; hence, primitive; simple; unsophisticated: as, aboriginal customs; aboriginal apathy.In geology and botany, native; indigenous; autochthonous.n. An original inhabitant; one of the people living in a country at the period of the earliest historical knowledge of it; an autochthon.n. A species of animals or plants which originated within a given area.