overnight telegram

noun

a type of domestic telegram sent at a reduced rate with a minimum charge for 10 words or less and accepted until midnight for delivery the following day.
the service offering such a telegram. Abbreviation: OTCompare fast telegram, personal-opinion telegram.

Origin of overnight telegram

First recorded in 1950–55

Formerly night letter.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018