Webster's English Dictionary

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monarch

mon.arch or mo.nar.chi.al \'ma:n-*rk, -.a:rk\ \m*-'na:r-k*l, ma:-\ 
   \-ke--*l\ n [LL monarcha, fr. Gk monarchos, fr. mon- + -archos -arc]h 1: a 
   person who reigns over a kingdom or empire : as  1a: a sovereign ruler  1b: 
   a constitutional king or queen  2: someone or something holding preeminent 
   position or power  3: a large migratory American butterfly (Danaus 
   plexippus) having ora nge-brown wings with black veins and borders and 
   larvae that feed on milkweed - mo.nar.cha.l aj