bipolar

Adjective

WordNet 3.0

Adjective (3)

of or relating to manic depressive illness
of, pertaining to, or occurring in both polar regions“the bipolar distribution of certain species”
having two poles

Webster's Dictionary (GCIDE)

Bipolar \Bi*po"lar\, a. [Pref. bi- + polar. Cf. Dipolar.] Doubly polar; having two poles; as, a bipolar cell or corpuscle. [1913 Webster]

Free On-line Dictionary of Computing

bipolar

1.<electronics> See bipolar transistor.

2.<communications> In digital transmission, an electrical line signalling method where the mark value alternates between positive and negative polarities.