supremacy

Concise Oxford English Dictionary © 2008 Oxford University Press:
supreme/suːˈpriːm/

▶adjective

• 1 highest in authority or rank.

• 2 very great or greatest; most important.

  ■ (of a penalty or sacrifice) involving death.

▶noun (also suprême) a rich cream sauce or a dish served in this.

– phrases
the Supreme Being a name for God.

– derivatives
supremacy noun,
supremely adverb.

– origin C15: from L. supremus, superlative of superus ‘that is above’; the noun is from Fr. suprême.