Webster's English Dictionary

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hat

hat \'hat\ n [ME, fr. OE ht; akin to OHG huot head covering - more at] 
   HOOD 1: a covering for the head usu. having a shaped crown and brim  2a: a 
   distinctive head covering worn as a symbol of office  2b: OFFICE, POSITION  
   : an entry into or readiness to enter a contest  - hat in the ring