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Adjective: daylong  'dey,long [N. Amer], 'dey,lóng [Brit]
  1. Lasting through an entire day
    "The daylong festival attracted thousands of visitors"
Adverb: daylong  'dey,long [N. Amer], 'dey,lóng [Brit]
  1. During the entire day
    "light pours daylong into the parlour";
    - all day long

See also: long