Red-letter Definition
rĕdlĕtər
adjective
Memorably happy.
A red-letter day.
American Heritage
Designating a memorable or joyous day or event: from the custom of marking holidays on the calendar in red ink.
Webster's New World
Particularly significant or positive.
Wiktionary
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
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