noun, masculine/dʁwa d‿o.bɛn/
In feudalism and the Ancien Régime, the right of an overlord or monarch to inherit the property of an unnaturalized foreigner, abolished in the French Revolution.
“Le droit d'aubaine, tel qu'il existait dans notre ancien droit, attribuait au souverain la succession de tous les étrangers morts en France.” — The right to the aubaine, as it existed in our former law, let the ruler claim the inheritance of all foreigners who died in France.
Literally, “entitlement to the aubaine”.