Haussmannian adjective1 •Of or relating to Georges-Eugène Haussmann (1809–1891), French civic planner involved in the extravagant rebuilding of Paris in the 1860s.Paris’ 1900s-era Haussmannian apartment buildings are charming, but they’re impossible to keep cool. — 2025 formsmore Haussmannian · most Haussmannian