quarter-caste adjective 1noun 1forms 1 adjective1 •(Australia, offensive) Having one "half-caste" parent; especially, having three Caucasian and one non-Caucasian grandparentsIt was the racist, settler colonialism that created whiteness, that created blackness, half-caste, quarter-caste, octoroon, that saw mixed-race people as a third race. — 2021 noun1 •(Australia, offensive) A person with one "half-caste" parent and one Caucasian parent formsquarter-castes