1. Relating to or having two poles or charges.
2. Relating to a device capable of using two polarizations, such as a transistor that uses positive and negative charge carriers.
3. Relating to or involving both of the earth's polar regions.
4. Having two opposite or contradictory ideas or natures: the bipolar world of the postwar period.
5. Biology Having two poles or opposite extremities: a bipolar neuron.
6. Psychiatry Of, relating to, or having bipolar disorder.
Informal A person with bipolar disorder.
bi′po·lari·ty (-lărĭ-tē) n.
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