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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Red-let·ter a. Of or pertaining to a red letter; marked by red letters.
 Red-letter day, a day that is fortunate or auspicious; -- so called in allusion to the custom of marking holy days, or saints' days, in the old calendars with red letters.
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From: WordNet (r) 2.0

 red-letter day
      n : a memorably happy or noteworthy day