noun, masculine/stad/plural: stades
stadion (Ancient Greek unit of measurement); stadium (Greek race course); stadium (sports arena); stage; stage (phase)
“un stade avancé d’une maladie” — an advanced stage of an illness
From Latin stadium, from Ancient Greek στάδιον (stádion), neuter form of στάδιος (stádios, “stable, firm”), from Proto-Indo-European *steh₂- (“to be standing”).