bailey /ˈbeɪli/ noun4 •The space immediately within the outer wall of a castle or fortress. •The outer wall of a feudal castle. •An argument which is controversial and more difficult to defend (in the context of a motte and bailey fallacy)."Birds are dinosaurs" is the bailey; "birds are more similar to dinosaurs than anything else" is the motte. — 2023 •A prison or court of justice. formsbaileys