Meaning of overnight telegram

overnight' tel"egram

Pronunciation: [key]
  1. 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.
  2. the service offering such a telegram. Abbr.: OT Cf.Formerly,
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.