Webster's English Dictionary

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prepotent

pre.po.tent \-*nt\ aj [ME, fr. L praepotent-, praepotens, fr. prae- + 
   potens]powerful - more at POTENT 1a: having exceptional power, authority, 
   or influence : PREEMINENT  1b: exceeding others in power  2: exhibiting 
   genetic prepotency  - pre.po.tent.ly av