The Collaborative International Dictionary of English v.0.48:

Journalist \Jour"nal*ist\, n. [Cf. F. journaliste.]
   1. One who keeps a journal or diary; a diarist. [Obs.]
      --Mickle.
      [1913 Webster]

   2. One whose occupation is to write for any of the public
      news media, such as newspapers, magazines, radio,
      television, or internet; also, an editorial or other
      professional writer for a periodical.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

journalist
    n 1: a writer for newspapers and magazines
    2: someone who keeps a diary or journal [syn: diarist, diary
       keeper, journalist]