Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Memorably happy.

from The Century Dictionary.

  • Having red letters; marked by red letters.
  • Hence— A fortunate or auspicious day.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to a red letter; marked by red letters.
  • adjective 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Particularly significant or positive.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective memorable for being a special occasion

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From the practice of marking in red the holy days in church calendars.]

Examples

  • A lot of people here identified as red-letter Christians, who believe the words of Jesus have been hijacked by worldly authorities.

    Rapture Ready!

  • I came back from a wonderful week in Capri in time for a hot, dusty Fourth of July, rather a red-letter day for many young birds taking their first flights.

    Bird Cloud

  • There's a red-letter day on the calendar approaching fast.

    Fantasy Insider: Upton among several Rays with upside

  • He was ravenous for the sweets that only on red-letter days he had ever tasted in his life.

    THE APOSTATE: written by Jack London

  • I came back from a wonderful week in Capri in time for a hot, dusty Fourth of July, rather a red-letter day for many young birds taking their first flights.

    Bird Cloud

  • On that red-letter day when I was alone in the house for the first time one eagle sat in a favorite perch tree across the river.

    Bird Cloud

  • Given its roots in fox hunting, which greeted each 26 December as a red-letter day, national hunt racing's King George VI Chase at Kempton is a Boxing Day staple since 1947 that has provided imperishable memories of courage and drama.

    How Boxing Day sport became a permanent fixture in our hearts | Rob Bagchi

  • As then-PC World editor David Bunnell noted a quarter of a century ago, the arrival of the personal computer was a red-letter event in the empowerment of the individual: We could now create, use, store and distribute our own information without having to ask for permission or approval from an information-technology priesthood.

    Data Caps as the Least Bad Answer

  • On one red-letter day he sent 19 witches to their deaths.

    The Blame Game

  • On that red-letter day when I was alone in the house for the first time one eagle sat in a favorite perch tree across the river.

    Bird Cloud

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