The Free On-line Dictionary of Computing (30 December 2018):

Turing test

    A criterion proposed by Alan
   Turing in 1950 for deciding whether a computer is
   intelligent.  Turing called it "the Imitation Game" and
   offered it as a replacement for the question, "Can machines
   think?"

   A human holds a written conversation on any topic with an
   unseen correspondent (nowadays it might be by electronic
   mail or chat).  If the human believes he is talking to
   another human when he is really talking to a computer then the
   computer has passed the Turing test and is deemed to be
   intelligent.

   Turing predicted that within 50 years (by the year 2000)
   technological progress would produce computing machines with a
   capacity of 10**9 bits, and that with such machinery, a
   computer program would be able to fool the average questioner
   for 5 minutes about 70% of the time.

   The Loebner Prize is a competition to find a computer
   program which can pass an unrestricted Turing test.

   Julia (http://fuzine.mt.cs.cmu.edu/mlm/julia.html) is a
   program that attempts to pass the Turing test.

   See also AI-complete.

   Turing's paper
   (http://cogprints.ecs.soton.ac.uk/archive/00000499/00/turing.html).

   (2004-02-17)