Source : Webster's Revised Unabridged Dictionary (1913)

Bipolar \Bi*po"lar\, a. [Pref. bi- + polar. Cf. {Dipolar}.]
   Doubly polar; having two poles; as, a bipolar cell or
   corpuscle.

Source : WordNet®

bipolar
     adj 1: of or relating to manic depressive illness
     2: of, pertaining to, or occurring in both polar regions; "the
        bipolar distribution of certain species"
     3: having two poles [ant: {unipolar}]

Source : Free On-Line Dictionary of Computing

bipolar
     
        1.  See {bipolar transistor}.
     
        2.  In digital transmission, an electrical
        line signalling method where the mark value alternates between
        positive and negative polarities.
     
        See also {AMI}.
     
        (1995-03-02)