The Collaborative International Dictionary of English v.0.48:

Intercurrent \In`ter*cur"rent\, a. [L. intercurrens, p. pr. of
   intercurrere: cf. F. intercurrent. See Intercur.]
   [1913 Webster]
   1. Running between or among; intervening. --Boyle. --Bp.
      Fell.
      [1913 Webster]

   2. (Med.)
      (a) Not belonging to any particular season.
      (b) Said of diseases occurring in the course of another
          disease. --Dunglison.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Intercurrent \In`ter*cur"rent\, n.
   Something intervening. --Holland.
   [1913 Webster]