Webster's English Dictionary

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beacon

1. bea.con \'be--k*n\ n [ME beken, fr. OE be-acen sign; akin to OHG bouhhan 
   sign] 1: a signal fire commonly on a hill, tower, or pole  2a: a lighthouse 
   or other signal for guidance  2b: a radio transmitter emitting signals for 
   guidance of airplanes 
2. beacon vt : to furnish with a beacon to shine as a beacon