Webster's English Dictionary

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supremacy

su.prem.a.cy \su.-'prem-*-se-\ n [supreme + -acy (as in primacy)] : the 
   quality or state of being supreme; also : supreme authority  or poweruence. 
   SUPREMACY implies superiority over all others; ASCENDANCY may imply 
   supremacy but involves necessarily only the idea of domination over one 
   other SYN syn SUPREMACY, ASCENDANCY mean first in rank, power, or infl