Red-letter meaning

rĕdlĕtər
Memorably happy.

A red-letter day.

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Designating a memorable or joyous day or event: from the custom of marking holidays on the calendar in red ink.
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Particularly significant or positive.
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Origin of red-letter

  • From the practice of marking in red the holy days in church calendars

    From American Heritage Dictionary of the English Language, 5th Edition