Lewis & Short

sŭprēmĭtas, ātis, f. [supremus], the highest extreme (late Lat.).

  1. I. The last of life, death: sepultura, qui supremitatis ho nor est, Amm. 31, 13, 17.
  2. II. The highest honor: supremitates et praeeminentias adire, Claud. Mam. Stat. Anim. 2, 13.