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- Dictionaryred-let·ter day/ˌred ˈledər ˌdā/
noun
- 1. a day that is pleasantly noteworthy or memorable: "the end of the financial year used to be a red-letter day for investors"
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noun
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Any day of special significance or opportunity
A red letter day (sometimes hyphenated as red-letter day) is any day of special significance or opportunity. Its roots are in classical antiquity; for instance, important days are indicated in red in a calendar dating from the Roman Republic (509–27 BC). Wikipedia