The Collaborative International Dictionary of English v.0.48:

Telegraphic \Tel`e*graph"ic\, a. [Cf. F. t['e]l['e]graphique.]
   1. Of or pertaining to the telegraph; made or communicated by
      a telegraph; as, telegraphic signals; telegraphic art;
      telegraphic intelligence.
      [1913 Webster]

   2. Having only the essential information; brief; concise;
      terse; -- of communications, by analogy with the style of
      telegrams, which are short to avoid unnecessary expense.

   Note: a telegraphic communication should have enough
         information to allow comprehension of the content,
         though it may leave out normally included words. If so
         much is left out that the communication becomes
         difficult or impossible to understand, it may be called
         cryptic. "Sighted sub. Sank same." is a telegraphic
         message.
         [PJC]

WordNet (r) 3.0 (2006):

telegraphic
    adj 1: of or relating to or transmitted by telegraph; "a
           telegraphic machine"; "telegraphic news reports"
    2: having the style of a telegram with many short words left
       out; "telegraphic economy of words"; "the strange telegraphic
       speech of some aphasics"