/ suːˈpriːm; NAmE ; BrE also sjuː-/ adjective [ usually before noun ]
1.
highest in rank or position :
the Supreme Commander of the armed forces
the supreme champion
It is an event in which she reigns supreme .
2.
very great or the greatest in degree :
to make the supreme sacrifice (= die for what you believe in)
a supreme effort
She smiled with supreme confidence.
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WORD ORIGIN
late 15th cent. (in the sense highest ): from Latin supremus , superlative of superus that is above, from super above.