Dictionary

red–letter

adjective red–let·ter \ˈred-ˌle-tər\

Definition of RED-LETTER

:  of special significance
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Origin of RED-LETTER

from the practice of marking holy days in red letters in church calendars
First Known Use: 1704
RED-LETTER Defined for Kids

red–letter

adjective red–let·ter \ˈred-ˈle-tər\

Definition of RED-LETTER for Kids

:  of special importance :  memorable <This was a red-letter day in my life.>

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