red-letter

adjective
red-let·​ter | \ ˈred-ˌle-tər How to pronounce red-letter (audio) \

Definition of red-letter

: of special significance

First Known Use of red-letter

1704, in the meaning defined above

History and Etymology for red-letter

from the practice of marking holy days in red letters in church calendars

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More Definitions for red-letter

red-letter

adjective
red-let·​ter | \ ˈred-ˈle-tər\

Kids Definition of red-letter

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