资料来源 : Webster's Revised Unabridged Dictionary (1913)

Summum bonum \Sum"mum bo"num\ [L.] (Philos.)
   The supreme or highest good, -- referring to the object of
   human life.

资料来源 : WordNet®

summum bonum
     n : the supreme good in which all moral values are included or
         from which they are derived