An Etymological Dictionary of Astronomy and Astrophysics

1. Highest in rank or authority.
   

   2. Of the highest quality, degree, character, importance, etc.

Etymology (EN): M.E., from M.Fr. suprême, and directly from L. supremus “highest,” superlative of superus “situated above,” from super “above,” → super-.

Etymology (PE): Abartom “highest,” from abar “high, upon,” → super-, + -tom superlative suffix, → extreme.