Source : Webster's Revised Unabridged Dictionary (1913)

Intermittent \In`ter*mit"tent\, a. [L. intermittens, -entis, p.
   pr. of intermittere: cf. F. intermittent.]
   Coming and going at intervals; alternating; recurrent;
   periodic; as, an intermittent fever. --Boyle.

   {Intermittent fever} (Med.), a disease with fever which
      recurs at certain intervals; -- applied particularly to
      fever and ague. See {Fever}.

   {Intermittent gearing} (Mach.), gearing which receives, or
      produces, intermittent motion.

   {Intermittent springs}, springs which flow at intervals, not
      apparently dependent upon rain or drought. They probably
      owe their intermittent action to their being connected
      with natural reservoirs in hills or mountains by passages
      having the form of a siphon, the water beginning to flow
      when it has accumulated so as to fill the upper part of
      the siphon, and ceasing when, by running through it, it
      has fallen below the orifice of the upper part of the
      siphon in the reservoir.

Intermittent \In`ter*mit"tent\, n. (Med.)
   An intermittent fever or disease. --Dunglison.

Source : WordNet®

intermittent
     adj 1: stopping and starting at irregular intervals; "intermittent
            rain showers"
     2: stopping and starting at regular intervals