su ‧ preme /sʊˈpriːm, sjuː- $ sʊ-, suː-/ BrE AmE adjective
[ Date: 1400-1500 ; Language: Latin ; Origin: supremus 'furthest above' , from superus ; ⇨ ↑ superior 1 ]
1 . having the highest position of power, importance, or influence:
the Supreme Allied Commander in Europe
a country where the car reigns supreme (=is the most important thing)
2 . [only before noun] the greatest possible:
supreme courage in the face of terrible danger
It required a supreme effort to stay awake.
a matter of supreme importance
3 . make the supreme sacrifice to die for your country, for a principle etc